diff --git a/easybuild/easyconfigs/a/assimp/assimp-5.4.3-GCCcore-13.3.0.eb b/easybuild/easyconfigs/a/assimp/assimp-5.4.3-GCCcore-13.3.0.eb
new file mode 100644
index 000000000000..3f0dfef4b647
--- /dev/null
+++ b/easybuild/easyconfigs/a/assimp/assimp-5.4.3-GCCcore-13.3.0.eb
@@ -0,0 +1,36 @@
+# Authors:: Richard Lawrence  <rarensu@tamu.edu> - TAMU HPRC - https://hprc.tamu.edu
+
+easyblock = 'CMakeMake'
+
+name = 'assimp'
+version = '5.4.3'
+
+homepage = 'https://github.com/assimp/assimp'
+description = """
+ Open Asset Import Library (assimp) is a library to import and export various
+ 3d-model-formats including scene-post-processing to generate missing render data.
+"""
+
+toolchain = {'name': 'GCCcore', 'version': '13.3.0'}
+
+source_urls = ['https://github.com/%(name)s/%(name)s/archive']
+sources = ['v%(version)s.tar.gz']
+checksums = ['66dfbaee288f2bc43172440a55d0235dfc7bf885dda6435c038e8000e79582cb']
+
+builddependencies = [
+    ('binutils', '2.42'),
+    ('pkgconf', '2.2.0'),
+    ('CMake', '3.29.3'),
+    ('zlib', '1.3.1'),
+]
+
+# workaround bug with GCC13 https://github.com/assimp/assimp/issues/5315
+configopts = "-DASSIMP_WARNINGS_AS_ERRORS=OFF "
+
+
+sanity_check_paths = {
+    'files': ['include/%(name)s/types.h', 'lib/libassimp.%s' % SHLIB_EXT],
+    'dirs': [],
+}
+
+moduleclass = 'vis'
diff --git a/easybuild/easyconfigs/d/double-conversion/double-conversion-3.3.0-GCCcore-13.3.0.eb b/easybuild/easyconfigs/d/double-conversion/double-conversion-3.3.0-GCCcore-13.3.0.eb
new file mode 100644
index 000000000000..c4b5780f6eec
--- /dev/null
+++ b/easybuild/easyconfigs/d/double-conversion/double-conversion-3.3.0-GCCcore-13.3.0.eb
@@ -0,0 +1,36 @@
+
+easyblock = 'CMakeMake'
+
+name = 'double-conversion'
+version = '3.3.0'
+
+homepage = 'https://github.com/google/double-conversion'
+description = "Efficient binary-decimal and decimal-binary conversion routines for IEEE doubles."
+
+toolchain = {'name': 'GCCcore', 'version': '13.3.0'}
+
+source_urls = ['https://github.com/google/%(name)s/archive']
+sources = ['v%(version)s.tar.gz']
+checksums = ['04ec44461850abbf33824da84978043b22554896b552c5fd11a9c5ae4b4d296e']
+
+builddependencies = [
+    ('binutils', '2.42'),
+    ('CMake', '3.29.3'),
+]
+
+# Build static lib, static lib with -fPIC and shared lib
+configopts = [
+    '',
+    "-DCMAKE_POSITION_INDEPENDENT_CODE=ON -DCMAKE_STATIC_LIBRARY_SUFFIX_CXX=_pic.a",
+    '-DBUILD_SHARED_LIBS=ON',
+]
+
+
+sanity_check_paths = {
+    'files': ['include/double-conversion/%s.h' % h for h in ['bignum', 'cached-powers', 'diy-fp', 'double-conversion',
+                                                             'fast-dtoa', 'fixed-dtoa', 'ieee', 'strtod', 'utils']] +
+             ['lib/libdouble-conversion.%s' % e for e in ['a', SHLIB_EXT]] + ['lib/libdouble-conversion_pic.a'],
+    'dirs': [],
+}
+
+moduleclass = 'lib'
diff --git a/easybuild/easyconfigs/n/NSPR/NSPR-4.35-GCCcore-13.3.0.eb b/easybuild/easyconfigs/n/NSPR/NSPR-4.35-GCCcore-13.3.0.eb
new file mode 100644
index 000000000000..9157abca1c4c
--- /dev/null
+++ b/easybuild/easyconfigs/n/NSPR/NSPR-4.35-GCCcore-13.3.0.eb
@@ -0,0 +1,33 @@
+easyblock = 'ConfigureMake'
+
+name = 'NSPR'
+version = '4.35'
+
+homepage = 'https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR'
+description = """Netscape Portable Runtime (NSPR) provides a platform-neutral API for system level
+ and libc-like functions."""
+
+toolchain = {'name': 'GCCcore', 'version': '13.3.0'}
+
+source_urls = ['https://ftp.mozilla.org/pub/%(namelower)s/releases/v%(version)s/src/']
+sources = [SOURCELOWER_TAR_GZ]
+checksums = ['7ea3297ea5969b5d25a5dd8d47f2443cda88e9ee746301f6e1e1426f8a6abc8f']
+
+builddependencies = [
+    ('binutils', '2.42'),
+]
+
+configopts = "--disable-debug --enable-optimize --enable-64bit"
+
+
+sanity_check_paths = {
+    'files': ['bin/nspr-config', 'lib/libnspr%(version_major)s.a', 'lib/libnspr%%(version_major)s.%s' % SHLIB_EXT,
+              'lib/libplc%(version_major)s.a', 'lib/libplc%%(version_major)s.%s' % SHLIB_EXT,
+              'lib/libplds%(version_major)s.a', 'lib/libplds%%(version_major)s.%s' % SHLIB_EXT,
+              'lib/pkgconfig/%(namelower)s.pc'],
+    'dirs': ['include/%(namelower)s'],
+}
+
+sanity_check_commands = ['%(namelower)s-config --version']
+
+moduleclass = 'lib'
diff --git a/easybuild/easyconfigs/n/NSS/NSS-3.104-GCCcore-13.3.0.eb b/easybuild/easyconfigs/n/NSS/NSS-3.104-GCCcore-13.3.0.eb
new file mode 100644
index 000000000000..fb301be49d57
--- /dev/null
+++ b/easybuild/easyconfigs/n/NSS/NSS-3.104-GCCcore-13.3.0.eb
@@ -0,0 +1,64 @@
+easyblock = 'MakeCp'
+
+name = 'NSS'
+version = '3.104'
+
+homepage = 'https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS'
+description = """Network Security Services (NSS) is a set of libraries designed to support cross-platform development
+ of security-enabled client and server applications."""
+
+toolchain = {'name': 'GCCcore', 'version': '13.3.0'}
+
+source_urls = ['https://ftp.mozilla.org/pub/security/nss/releases/NSS_%s_RTM/src/' % version.replace('.', '_')]
+sources = [SOURCELOWER_TAR_GZ]
+patches = [
+    '%(name)s-3.39_pkgconfig.patch',
+    '%(name)s-3.55_fix-ftbfs-glibc-invalid-oob-error.patch',
+]
+checksums = [
+    {'nss-3.104.tar.gz': 'e2763223622d1e76b98a43030873856f248af0a41b03b2fa2ca06a91bc50ac8e'},
+    {'NSS-3.39_pkgconfig.patch': '5c4b55842e5afd1e8e67b90635f6474510b89242963c4ac2622d3e3da9062774'},
+    {'NSS-3.55_fix-ftbfs-glibc-invalid-oob-error.patch':
+     '15768297c5dd6918132af281531afcfe3e358f45a00bc2655d20a6cbe4310a9b'},
+]
+
+builddependencies = [
+    ('binutils', '2.42'),
+    ('Perl', '5.38.2'),
+]
+dependencies = [
+    ('NSPR', '4.35'),
+    ('zlib', '1.3.1'),
+]
+
+# disable use of -Werror to work around compilation errors with newer glibc versions,
+# see also https://sourceware.org/bugzilla/show_bug.cgi?id=27476
+buildopts = 'NSS_ENABLE_WERROR=0 BUILD_OPT=1 USE_64=1 '
+buildopts += 'CPATH="$EBROOTNSPR/include/nspr:$CPATH" OS_REL_CFLAGS="-D_XOPEN_SOURCE "'
+buildopts += ' && cd config && make PREFIX=%(installdir)s BUILD_OPT=1 USE_64=1 && cd -'
+
+# building in parallel fails
+parallel = 1
+
+# optional testsuite (takes a long time)
+# buildopts += " && cd %(builddir)s/%(namelower)s-%(version)s/%(namelower)s/tests && "
+# buildopts += " BUILD_OPT=1 USE_64=1 ./all.sh "
+
+files_to_copy = [
+    '../dist/Linux*.OBJ/*',
+    (['../dist/public/*'], 'include'),
+]
+
+sanity_check_paths = {
+    'files': ['bin/%(namelower)s-config', 'bin/multinit', 'lib/libnss.a'],
+    'dirs': ['include/dbm', 'include/%(namelower)s'],
+}
+
+sanity_check_commands = [
+    "multinit --help",
+    "%(namelower)s-config --version",
+]
+
+modextrapaths = {'CPATH': 'include/%(namelower)s'}
+
+moduleclass = 'lib'
diff --git a/easybuild/easyconfigs/q/Qt6/Qt6-6.7.2-GCCcore-13.3.0.eb b/easybuild/easyconfigs/q/Qt6/Qt6-6.7.2-GCCcore-13.3.0.eb
new file mode 100644
index 000000000000..deb2902a42a2
--- /dev/null
+++ b/easybuild/easyconfigs/q/Qt6/Qt6-6.7.2-GCCcore-13.3.0.eb
@@ -0,0 +1,90 @@
+easyblock = 'CMakeNinja'
+
+name = 'Qt6'
+version = '6.7.2'
+
+homepage = 'https://qt.io/'
+description = "Qt is a comprehensive cross-platform C++ application framework."
+
+toolchain = {'name': 'GCCcore', 'version': '13.3.0'}
+# disabling use of -ftree-vectorize is required to avoid compilation failures on some systems (e.g. Intel Skylake X)
+toolchainopts = {'vectorize': False}
+
+source_urls = [
+    'https://download.qt.io/official_releases/qt/%(version_major_minor)s/%(version)s/single/',
+    'https://download.qt.io/archive/qt/%(version_major_minor)s/%(version)s/single/',
+    'https://download.qt.io/new_archive/qt/%(version_major_minor)s/%(version)s/single/',
+]
+sources = ['qt-everywhere-src-%(version)s.tar.xz']
+patches = [
+    '%(name)s-6.6.3_fix_OF-Gentoo.patch',
+    'Qt6-6.7.2_fix_cpu_features.patch',
+]
+checksums = [
+    {'qt-everywhere-src-6.7.2.tar.xz': '0aaea247db870193c260e8453ae692ca12abc1bd841faa1a6e6c99459968ca8a'},
+    {'Qt6-6.6.3_fix_OF-Gentoo.patch': 'd4d4878ac76cb985e45eb3b6e90ba2233f65807d6bd9bbe2b71365b181347b7b'},
+    {'Qt6-6.7.2_fix_cpu_features.patch': '3f37e7a4e4ed38cc82037be9504bc644e48bf258555ffff848183142725c9dc8'},
+]
+
+builddependencies = [
+    ('binutils', '2.42'),
+    ('pkgconf', '2.2.0'),
+    ('CMake', '3.29.3'),
+    ('Ninja', '1.12.1'),
+    # deps for QtWebEngine
+    ('Bison', '3.8.2'),
+    ('flex', '2.6.4'),
+    ('gperf', '3.1'),
+    ('re2c', '3.1'),
+]
+dependencies = [
+    ('double-conversion', '3.3.0'),
+    ('GLib', '2.80.4'),
+    ('PCRE2', '10.43'),
+    ('libpng', '1.6.43'),
+    ('LibTIFF', '4.6.0'),
+    ('libwebp', '1.4.0'),
+    ('JasPer', '4.2.4'),
+    ('HarfBuzz', '9.0.0'),
+    ('SQLite', '3.45.3'),
+    ('graphite2', '1.3.14'),
+    ('assimp', '5.4.3'),  # for Qt 3D
+    ('FFmpeg', '7.0.2'),
+    ('X11', '20240607'),
+    ('fontconfig', '2.15.0'),
+    ('zlib', '1.3.1'),
+    ('Python', '3.12.3'),
+    ('Python-bundle-PyPI', '2024.06'),
+    ('freetype', '2.13.2'),  # WebEngine
+    ('DBus', '1.15.8'),
+    ('libevent', '2.1.12'),  # WebEngine
+    ('libGLU', '9.0.3'),
+    ('libjpeg-turbo', '3.0.1'),  # WebEngine
+    ('NSS', '3.104'),  # WebEngine, required
+    ('snappy', '1.2.1'),  # WebEngine
+    ('OpenSSL', '3', '', SYSTEM),
+    ('ICU', '75.1'),
+    ('nodejs', '20.13.1'),
+    # ('gRPC', '1.52.2'),  # WebEngine needs older Abseil/gRPC/protobuf
+]
+
+preconfigopts = 'sed -i "s/MultiMedia/Multimedia/g" ../qt-everywhere-src-%(version)s/qtcharts/CMakeLists.txt && '
+
+preconfigopts += 'sed -i "23i set(Python3_ROOT_DIR \\$ENV{EBROOTPYTHON})" '
+preconfigopts += '../qt-everywhere-src-%(version)s/qtwebengine/src/gn/CMakeLists.txt && '  # Typo
+
+configopts = "-Wno-dev -DFEATURE_qtpdf_build=OFF -DQT_AVOID_CMAKE_ARCHIVING_API=ON "
+configopts += "-DPython3_ROOT_DIR=$EBROOTPYTHON -DBUILD_qtwayland=OFF "
+
+
+# Removed from Qt6.0.0 but may be added back in the future
+# configopts += '-DBUILD_qtgamepad=OFF '  # Does not work on CentOS 7
+
+sanity_check_paths = {
+    'files': ['bin/qmake6', 'lib/libQt6Core.%s' % SHLIB_EXT, 'lib/libQt6WebEngineCore.%s' % SHLIB_EXT],
+    'dirs': ['include/QtCore', 'include/QtWebEngineCore'],
+}
+
+sanity_check_commands = ['qmake6 --help']
+
+moduleclass = 'devel'
diff --git a/easybuild/easyconfigs/q/Qt6/Qt6-6.7.2_fix_cpu_features.patch b/easybuild/easyconfigs/q/Qt6/Qt6-6.7.2_fix_cpu_features.patch
new file mode 100644
index 000000000000..0109ba0726b9
--- /dev/null
+++ b/easybuild/easyconfigs/q/Qt6/Qt6-6.7.2_fix_cpu_features.patch
@@ -0,0 +1,56 @@
+# What: Comment out incorrect detection of CPU features when only AVX2 flag is set.
+#       See relevant bug reports:
+#        https://bugs.gentoo.org/908420
+#        https://bugs.gentoo.org/898644
+# Author: maxim-masterov (SURF)
+diff -Nru qt-everywhere-src-6.7.2.orig/qtbase/src/corelib/global/qsimd_p.h qt-everywhere-src-6.7.2/qtbase/src/corelib/global/qsimd_p.h
+--- qt-everywhere-src-6.7.2.orig/qtbase/src/corelib/global/qsimd_p.h	2024-09-20 12:05:26.732359000 +0200
++++ qt-everywhere-src-6.7.2/qtbase/src/corelib/global/qsimd_p.h	2024-09-23 22:31:44.861936347 +0200
+@@ -227,14 +227,14 @@
+ #  if defined(__AVX2__)
+ // List of features present with -march=x86-64-v3 and not architecturally
+ // implied by __AVX2__
+-#    define ARCH_HASWELL_MACROS     \
+-    (__AVX2__ + __BMI__ + __BMI2__ + __F16C__ + __FMA__ + __LZCNT__ + __POPCNT__)
+-#    if ARCH_HASWELL_MACROS != 7
+-#      error "Please enable all x86-64-v3 extensions; you probably want to use -march=haswell or -march=x86-64-v3 instead of -mavx2"
+-#    endif
+-static_assert(ARCH_HASWELL_MACROS, "Undeclared identifiers indicate which features are missing.");
+-#    define __haswell__       1
+-#    undef ARCH_HASWELL_MACROS
++//#    define ARCH_HASWELL_MACROS     \
++//    (__AVX2__ + __BMI__ + __BMI2__ + __F16C__ + __FMA__ + __LZCNT__ + __POPCNT__)
++//#    if ARCH_HASWELL_MACROS != 7
++//#      error "Please enable all x86-64-v3 extensions; you probably want to use -march=haswell or -march=x86-64-v3 instead of -mavx2"
++//#    endif
++//static_assert(ARCH_HASWELL_MACROS, "Undeclared identifiers indicate which features are missing.");
++//#    define __haswell__       1
++//#    undef ARCH_HASWELL_MACROS
+ #  endif
+ 
+ // x86-64 sub-architecture version 4
+@@ -244,15 +244,15 @@
+ // with AVX512 support and it includes all of these too. The GNU libc subdir for
+ // this is "glibc-hwcaps/x86-64-v4".
+ //
+-#  define ARCH_SKX_MACROS           (__AVX512F__ + __AVX512BW__ + __AVX512CD__ + __AVX512DQ__ + __AVX512VL__)
+-#  if ARCH_SKX_MACROS != 0
+-#    if ARCH_SKX_MACROS != 5
+-#      error "Please enable all x86-64-v4 extensions; you probably want to use -march=skylake-avx512 or -march=x86-64-v4 instead of -mavx512f"
+-#    endif
+-static_assert(ARCH_SKX_MACROS, "Undeclared identifiers indicate which features are missing.");
+-#    define __skylake_avx512__  1
+-#  endif
+-#  undef ARCH_SKX_MACROS
++//#  define ARCH_SKX_MACROS           (__AVX512F__ + __AVX512BW__ + __AVX512CD__ + __AVX512DQ__ + __AVX512VL__)
++//#  if ARCH_SKX_MACROS != 0
++//#    if ARCH_SKX_MACROS != 5
++//#      error "Please enable all x86-64-v4 extensions; you probably want to use -march=skylake-avx512 or -march=x86-64-v4 instead of -mavx512f"
++//#    endif
++//static_assert(ARCH_SKX_MACROS, "Undeclared identifiers indicate which features are missing.");
++//#    define __skylake_avx512__  1
++//#  endif
++//#  undef ARCH_SKX_MACROS
+ #endif  /* Q_PROCESSOR_X86 */
+ 
+ // NEON intrinsics
diff --git a/easybuild/easyconfigs/r/re2c/re2c-3.1-GCCcore-13.3.0.eb b/easybuild/easyconfigs/r/re2c/re2c-3.1-GCCcore-13.3.0.eb
new file mode 100644
index 000000000000..d40fa7867229
--- /dev/null
+++ b/easybuild/easyconfigs/r/re2c/re2c-3.1-GCCcore-13.3.0.eb
@@ -0,0 +1,33 @@
+easyblock = 'ConfigureMake'
+
+name = 're2c'
+version = '3.1'
+
+homepage = 'https://re2c.org'
+description = """re2c is a free and open-source lexer generator for C and C++. Its main goal is generating
+fast lexers: at least as fast as their reasonably optimized hand-coded counterparts. Instead of using
+traditional table-driven approach, re2c encodes the generated finite state automata directly in the form
+of conditional jumps and comparisons."""
+
+toolchain = {'name': 'GCCcore', 'version': '13.3.0'}
+
+source_urls = ['https://github.com/skvadrik/%(name)s/releases/download/%(version)s']
+sources = [SOURCE_TAR_XZ]
+checksums = ['0ac299ad359e3f512b06a99397d025cfff81d3be34464ded0656f8a96676c029']
+
+builddependencies = [
+    ('binutils', '2.42'),
+    ('Python', '3.12.3'),
+]
+
+configopts = '--disable-rust'
+
+
+sanity_check_paths = {
+    'files': ['bin/%(name)s'],
+    'dirs': [],
+}
+
+sanity_check_commands = ['%(name)s --help']
+
+moduleclass = 'tools'
diff --git a/easybuild/easyconfigs/s/snappy/snappy-1.2.1-GCCcore-13.3.0.eb b/easybuild/easyconfigs/s/snappy/snappy-1.2.1-GCCcore-13.3.0.eb
new file mode 100644
index 000000000000..2310edf55555
--- /dev/null
+++ b/easybuild/easyconfigs/s/snappy/snappy-1.2.1-GCCcore-13.3.0.eb
@@ -0,0 +1,38 @@
+
+easyblock = 'CMakeMake'
+
+name = 'snappy'
+version = '1.2.1'
+
+homepage = 'https://github.com/google/snappy'
+description = """Snappy is a compression/decompression library. It does not aim
+for maximum compression, or compatibility with any other compression library;
+instead, it aims for very high speeds and reasonable compression."""
+
+toolchain = {'name': 'GCCcore', 'version': '13.3.0'}
+
+source_urls = ['https://github.com/google/%(name)s/archive/']
+sources = ['%(version)s.tar.gz']
+patches = ['%(name)s-1.1.9_use-default-rtti.patch']
+checksums = [
+    {'1.2.1.tar.gz': '736aeb64d86566d2236ddffa2865ee5d7a82d26c9016b36218fcc27ea4f09f86'},
+    {'snappy-1.1.9_use-default-rtti.patch': 'af56538330b2d781677c7d94576c15fc36e004ae0b4f1ac7d86bbec22b65e73d'},
+]
+
+builddependencies = [
+    ('binutils', '2.42'),
+    ('CMake', '3.29.3'),
+]
+
+configopts = [
+    "-DSNAPPY_BUILD_TESTS=OFF -DSNAPPY_BUILD_BENCHMARKS=OFF",
+    "-DBUILD_SHARED_LIBS=ON -DSNAPPY_BUILD_TESTS=OFF -DSNAPPY_BUILD_BENCHMARKS=OFF",
+]
+
+
+sanity_check_paths = {
+    'files': ['lib64/libsnappy.a', 'lib64/libsnappy.%s' % SHLIB_EXT, 'include/snappy.h'],
+    'dirs': [],
+}
+
+moduleclass = 'lib'