Keycloak : Keycloak is an Open Source Identity and Access Management solution for modern Applications and Services.
Arora : Arora is a lightweight cross-platform web browser. It's free (as in free speech and free beer). Arora runs on Linux, embedded Linux, FreeBSD, Mac OS X...
DokuWiki : DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.