
Unvanquished has been a very promising open-source game project succeeding the former Tremulous project. As part of Unvanquished, Daemon Engine as their downstream and much improved version of the open-source id Tech 3 has continued advancing.
While Unvanquished was known for their monthly alpha releases years ago, those dried up and it's been quite a while without any Unvanquished alpha/beta... But today thankfully there is the v0.52 beta in time for any weekend Linux gamers.
Many more details and screenshots on the Unvanquished 0.52 beta can be found via Unvanquished.net . Multi-platform binary download and sources on GitHub .