I used ICQ. To tell you when, my UIN was 3393702. >.> Low 7 digits!

I was actually laughing about this earlier today about Newgrounds, which has the same list.

I didn't use Trillian in specific, but I used Pidgin and Adium. Even today I use a program of my own creation to log into multiple services at once, although those services are shutting down one by one.
Mega Man: The Light of Will (Mega Man / Green Lantern crossover: In the lead-up to the events of Mega Man 2, Dr. Wily has discovered emotional light technology. How will his creations change how humankind thinks about artificial intelligence? Sadly abandoned. Sufficient Velocity x-post)

Games by Coda (updated 11/24/2019 - New game: Jigsawmino)
Art by Coda (updated 4/20/2020 - untitled original music)