Remembering this has recently become a brain worm for me, so I must share:
It’s a wonder I got out of the 70s alive.
Web-based TR-909 simulator
Somebody has created a web-based simulator of the classic Roland TR-909 drum machine.
I’m familiar with the use of this gem via Propellerhead’s excellent, but now-defunct ReBirth, which simulated the 909, along with the 808 and the 303.
Anyway, the web-based version is a nifty little time-waster.