See adversary, do adversary: Simple execution of commands for defensive tuning/research (now with more ELF on the shelf)

Coyote is a standalone C# post-exploitation implant for maintaining access to compromised Windows infrastructure during red team engagements using DNS tunneling.

Expeditus is a loader that executes shellcode on a target Windows system. It combines several offensive techniques in order to attempt to do this with some level of stealth.