The latest version of fRaBs (Free Abuse 2.1) running on the Abuse SDL port (0.9a) released in 2016.
"fRaBs is just a silly acronym for 'Free Abuse'. It has the network support of the registered version,
but also comes equipped with many new single player and deathmatch levels, as well as additional
enemies and artwork, all coming from outside, free sources. As far as I know, there is no material in this archive that is not public domain. I sure hope that the acronym is justified." - Justin Cassidy
fRaBs is a collection of community made maps and addons. Game starts in a "hub" area with teleporters and each teleporter is a new campaign. I don't know if each campaign is completely independent or if they are connected in any way. The first teleporter top-left contains levels from the shareware version. I have not tested everything, only the first two areas. Multiplayer was disabled since it doesn't work in the SDL version, you can try the DOS version instead using DOSBox.
ReadMe files, documentation and original archive are located in the DOCS folder.
Original archive is still available here: Web.archive.org
fRaBs SDL includes files from the 2016 SDL port:
In the config file "hires" and "big_font" must remain 0. "Music" folder was renamed to disable music.