The Jupiter-8, or JP-8, is an eight-voice polyphonic analog subtractive synthesizer introduced by Roland Corporation in early 1981.
Bandpassy tape simulation, updated for high sample rate and aliasing control. Good for emphazising certain frequencies besides getting a tape cassette color. Get it for free from Airwindows or better donate if you can.
OR2v is an Oberheim Two Voice emulation. Oberheim Two Voice is an analog duophonic synthesizer featuring a 8 step sequencer. 32 Bit only.
IK Multimedia offers a free Memory-V synth rompler. You have to be/become a newsletter subscriber and then install the free version of Syntronik, which the Memory-V is a part of (video instruction). This offer is limited to Feb 26th !