Atramhasis is an open-source, web-based SKOS editor. You can use it to browse SKOS vocabularies, thesauri, authority files, word lists, ... Atramhasis also comes with an admin interface you can use to add the concepts and collections of your vocabularies.
This beta release is the first public release of version 0.5. This version has a strong focus on the User Interface. Both the public frontend and the admin backend have been completely reworked. The underlying REST services have remained stable, but have been expanded with a few attributes. It is now possible to add sources to concepts and collections. Editing a conceptscheme through the interface has been added as well.