Analog Waveforms is a free plugin featuring the basic waveforms of an analog synthesizer. Each waveform has been sampled note by note across 7 octaves (each sample being 10 seconds in length) which gives an accurate and genuine sonic representation of an analog synthesizer. The synthesizer in question is the Mopho by DSi.
All the samples have been looped for sustain notes and they are made available to the public domain. They can be downloaded separately from the plugin.