diff --git a/easybuild/easyconfigs/g/gmsh/gmsh-4.12.2-foss-2023b.eb b/easybuild/easyconfigs/g/gmsh/gmsh-4.12.2-foss-2023b.eb
new file mode 100644
index 000000000000..922916cc5565
--- /dev/null
+++ b/easybuild/easyconfigs/g/gmsh/gmsh-4.12.2-foss-2023b.eb
@@ -0,0 +1,43 @@
+easyblock = 'CMakeMake'
+
+name = 'gmsh'
+version = '4.12.2'
+
+homepage = 'https://gmsh.info/'
+description = "Gmsh is a 3D finite element grid generator with a build-in CAD engine and post-processor."
+
+toolchain = {'name': 'foss', 'version': '2023b'}
+toolchainopts = {'usempi': True}
+
+source_urls = ['https://%(name)s.info/src/']
+sources = ['%(name)s-%(version)s-source.tgz']
+checksums = ['13e09d9ca8102e5c40171d6ee150c668742b98c3a6ca57f837f7b64e1e2af48f']
+
+builddependencies = [
+    ('CMake', '3.27.6'),
+    ('SWIG', '4.1.1'),
+    ('Eigen', '3.4.0'),
+]
+
+dependencies = [
+    ('Python', '3.11.5'),
+    ('PETSc', '3.22.5'),
+    ('SLEPc', '3.22.2'),
+    ('FLTK', '1.3.9'),
+    ('occt', '7.8.0'),
+]
+
+separate_build_dir = True
+
+configopts = "-DENABLE_BUILD_SHARED=ON -DENABLE_WRAP_PYTHON=ON -DENABLE_METIS=1"
+
+sanity_check_paths = {
+    'files': ['bin/%(name)s', 'bin/onelab.py', 'lib/%(name)s.py', 'lib/libgmsh.%s' % SHLIB_EXT],
+    'dirs': [],
+}
+
+sanity_check_commands = ['%(name)s --help']
+
+modextrapaths = {'PYTHONPATH': ['lib']}
+
+moduleclass = 'math'
diff --git a/easybuild/easyconfigs/o/occt/occt-7.8.0-GCCcore-13.2.0.eb b/easybuild/easyconfigs/o/occt/occt-7.8.0-GCCcore-13.2.0.eb
new file mode 100644
index 000000000000..59117a5cd247
--- /dev/null
+++ b/easybuild/easyconfigs/o/occt/occt-7.8.0-GCCcore-13.2.0.eb
@@ -0,0 +1,47 @@
+easyblock = 'CMakeMake'
+
+name = 'occt'
+version = '7.8.0'
+
+homepage = 'https://www.opencascade.com/'
+description = """Open CASCADE Technology (OCCT) is an object-oriented C++
+class library designed for rapid production of sophisticated domain-specific
+CAD/CAM/CAE applications."""
+
+toolchain = {'name': 'GCCcore', 'version': '13.2.0'}
+
+source_urls = ['https://github.com/Open-Cascade-SAS/OCCT/archive/refs/tags']
+sources = ['V7_8_0.tar.gz']
+checksums = ['096cd0f268fa9f6a50818e1d628ac92ecf87e10fd72187e2e8d6be57dfe12530']
+
+builddependencies = [
+    ('CMake', '3.27.6'),
+    ('Doxygen', '1.9.8'),
+    ('binutils', '2.40'),
+]
+dependencies = [
+    ('Mesa', '23.1.9'),
+    ('freetype', '2.13.2'),
+    ('Tcl', '8.6.13'),
+    ('Tk', '8.6.13'),
+    ('FreeImage', '3.18.0'),
+    ('tbb', '2021.13.0'),
+]
+
+
+separate_build_dir = True
+
+configopts = "-DUSE_FREEIMAGE=ON -D3RDPARTY_FREEIMAGE_DIR=$EBROOTFREEIMAGE "
+configopts += "-D3RDPARTY_TBB_DIR=$EBROOTTBB "
+configopts += "-D3RDPARTY_TCL_DIR=$EBROOTTCL "
+configopts += "-D3RDPARTY_TK_DIR=$EBROOTTK "
+configopts += "-D3RDPARTY_FREETYPE_DIR=$EBROOTFREETYPE "
+
+sanity_check_paths = {
+    'files': ['bin/DRAWEXE', 'bin/env.sh'],
+    'dirs': ['lib/cmake/opencascade'],
+}
+
+sanity_check_commands = ['DRAWEXE -h']
+
+moduleclass = 'cae'
diff --git a/easybuild/easyconfigs/s/SLEPc/SLEPc-3.22.2-foss-2023b.eb b/easybuild/easyconfigs/s/SLEPc/SLEPc-3.22.2-foss-2023b.eb
new file mode 100644
index 000000000000..7aaab3b51521
--- /dev/null
+++ b/easybuild/easyconfigs/s/SLEPc/SLEPc-3.22.2-foss-2023b.eb
@@ -0,0 +1,21 @@
+name = 'SLEPc'
+version = '3.22.2'
+
+homepage = 'https://slepc.upv.es'
+description = """SLEPc (Scalable Library for Eigenvalue Problem Computations) is a software library for the solution
+ of large scale sparse eigenvalue problems on parallel computers. It is an extension of PETSc and can be used for
+ either standard or generalized eigenproblems, with real or complex arithmetic. It can also be used for computing a
+ partial SVD of a large, sparse, rectangular matrix, and to solve quadratic eigenvalue problems."""
+
+toolchain = {'name': 'foss', 'version': '2023b'}
+toolchainopts = {'usempi': True, 'openmp': True}
+
+source_urls = ['https://slepc.upv.es/download/distrib']
+sources = [SOURCELOWER_TAR_GZ]
+checksums = ['b60e58b2fa5eb7db05ce5e3a585811b43b1cc7cf89c32266e37b05f0cefd8899']
+
+dependencies = [('PETSc', '3.22.5')]
+
+petsc_arch = 'installed-arch-linux2-c-opt'
+
+moduleclass = 'numlib'