acid rack is a free software synthesizer developed by acid.milch&honig. Available format(s): VST for Windows.
acid rack is a small virtual analog style synthesizer plug-in with 2 VCOs, 2 LFOs, arpeggiator, 3 envelopes and a multi-mode VCF. acidrack works in poly, mono, legato and with a switchable unison mode. It also has a random-generator for plug-in parameters.
http://acidspace.acid-milch-und-honig.de/