The Nine Tenths Sourcemod, GMod 9 gamemode, and Fretta gamemode. Ported to GMod 13 in one package.
Same as MelonRacer, bug fixes and quality of life changes welcome.
For serious gameplay changes, consider making a mod using one of the many hooks available.
Feel free to fork this gamemode and publish it by yourself, just give credit to Garry Newman and me.