VST2 Version of Opensource VST plug-ins

[Schmitty2005]

Open-sourced VST's are slowly moving to VST3 only.  The links below are for the last VST2 versions of these open source synths:

Dexed 0.94 VST2 (V0.96 is VST3 only)
https://github.com/asb2m10/dexed/releases/tag/v0.9.4hf1

Surge 1.6.6 VST2 (V1.70 is VST3 only)
https://github.com/surge-synthesizer/releases/releases/tag/1.6.6

[Schmitty2005]

OctaSine is a VST2 FM Synth :

OctaSine  : https://www.octasine.com/
Source :  https://github.com/greatest-ape/OctaSine