Free chip synth with great presets
38911 Bytes by Odo is a free vst chip synth with a fantastic sound.
Basically it's a 1 oscillator synth with 4 waveforms:
Saw, Triangle, Pulse, and pitched Noise.
To shape the generated sound, the 38911 Bytes chip synth comes with a ringmodulation oscillator with 3 waveforms (saw,triangle,pulse), two LFOs with 19 waveforms, three 8-step sequencers (1 waveform, 1 octave, 1 note), and three ADSR-envelopes (filter, pulse, and pitch).
38911 Bytes comes with 128 great chip-tune presets.