The string does not match any major Scene group. It is likely from a P2P (peer-to-peer) release where the original uploader created their own tag. Searches on old forums like Astalavista or PacketStorm show that "thmyl" appears in other contexts (e.g., "thmyl-winamp-pro-5-keygen"), suggesting a single anonymous cracker using that handle.
When Adobe released Photoshop 7.0 in March 2002, it introduced tools that are still standard today: