gm_sts is a gamemode built in Garry's mod originally by Tergative. It is inspired by the Sven Co-op map bm_sts by Trempler. The gameplay consists of randomizing and upgrading units as a team and fighting against other team's units. Every two rounds a bonus round occurs which awards teams points based on objectives completed. The latest release is the version hosted on the Steam Workshop.
Yes please! I highly suggest you use VSCode with the GLuaLint and GLua Enhanced extensions.