A long demo of a Roland TB-303, with the Borg modifications by Analogue Solutions. Also in the mix is a TR-808, acting as the master, with a little reverb; the 303 is 100% dry.
via Matrix

Nice demo of using the Future Retro Revolution as an audio processor.
With an analog resonant filter, envelope, overdrive, and DSP effects, the Revolution makes a powerful effects processor. The Elektron is slaved to the Revolution’s MIDI.
via BigCityMusic

Probably no synth has been cloned more times, both in hardware and software, than the Roland TB303.
But while excellent hardware 303 clones (FR777) have been available for years, virtual versions have never been completely satisfying.
AudioRealism’s BassLine 2 changes that. It cranks out authentic 303 sounds, using a simple interface that will be familiar to 303 [...]

 

 AudioRealism Bassline Demo [1:12m]: Play Now | Play in Popup | Download

 

 AudioRealism Bass Line 2 Loop 01 [0:16m]: Play Now | Play in Popup | Download

 

 AudioRealism Bass Line Acid Loop 02 [0:14m]: Play Now | Play in Popup | Download

Hotelsinus Sound Design has released the Hotelsinus Reese Bassline, a free new VST designed specificaly for Drum and Bass music.
The instrument can create wide variety of sounds, like Hard Bass, Dark Background Atmosphere and the sounds of Reese.
Hotelsinus Reese Bassline is a SynthEdit VST instrument for Windows – a Mac OSX version is expected [...]

TAL-BassLine is a virtal analog bass synthesizer especially made for bass, acid sounds and effects.
A unique -18dB low pass filter with a lot of asymmetric and random components introduce a warm and analogue sound. Fast, non linear envelopes are also a part of this synth.
Best of all - it’s free for both Mac and Windows.
Features: [...]

Check out this insane stop-motion animation of building an x0xb0x bassline synth:

x0xb0x is a very cool DIY project that recreates the classic Roland TB303.
emerography via AudioLemon