This is the official development for SiteOrigin's Page Builder plugin. You can browse the source and take a look at what we're working on. We welcome issue reports and pull requests.
Changes here are pushed to our plugin page on WordPress.org. This is where you should download stable releases.
We handle support on the SiteOrigin support forums. We won't be handling support questions on Github.
We have usage documentation on SiteOrigin. We're working on developer documentation and will release that here on Github.