Watch (and copy) Francis Preve’s approach to simulate a 303 inside Serum.
You can freely download the classic VSTs Neon and the Karlette from Steinberg.
Percussion Synthesizer is inspired by the Korg ER-1 synth part from BasicHumanTastes and is a free M4L patch.
Native Instruments offer a ton of sounds (2000) and instruments (Synths, Smaples Instruments) plus an organizer app (Komplete Kontrol) for free. Download here.
A nice & free chorus effect plugin from Acon.
Check it examples:
Keen On Keys reviews 3 emulations of the classic VL-1. If you’re into Lo-Fi check the discription of his video for the download links.
Francis Preve explains how to use Ableton’s Simpler to create your own wavetables in this article.