TWRP is an open source, community project. TWRP development is done by roughly 4 people at this point. TWRP also have a large support community with many people who are willing to answer questions and help people with their devices either through our IRC channel or on forums like xda-developers. TeamWin was originally formed to work on porting WiMAX to CM7 for the HTC EVO 4G. After their work on the EVO 4G they wanted to work on a project that would work on more devices than just the EVO 4G and they settled on working on a recovery. Today TWRP is the leading custom recovery for Android phones. DISCLAIMER : TeamWin team and myself will never ever be responsible for any damage you do to your device ! ALL CREDIT GOES TO AND ONLY TO : -> TeamWin & OmniROM teams (TWRP tree). -> CyanogenMod team (ROM + device + kernel trees). -> @k2wl (DS device tree). -> TheMuppets team (vendor tree). NOTE : i am not affiliated with any of the teams mentioned...
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