If you're on PC, this free SH-101 VST
was made with Synthedit.MDA JX10
is free and sounds very Roland-like to me.
There is a better pay version of the Juno 60 by TAL called U No LX
Audiorealism ABL Pro
is kind of a hybrid 303 and 101/202.
edit: I've played with U No LX a bit and it needs some EQ correction to sound more authentic. Here are the EQ corrections I made:
- Low Shelf: 800 hz, +4.0db, 0.8 bandwidth
- Band: 600 hz, +4.0db, 1.0 bandwidth
- Band: 2.7khz, -2.5db, 1.25 bandwidth
I also boosted a 10.5 khz small band about + 6db for brighter sounds, but this is less critical and can actually make the extreme treble sound too clean when up front in a mix.