If you're still looking for VST's here are a few resources that are geared towards chip tunes, since that seems to be what you're interested in making. If you're looking for a one stop shop solution not just for chip music Native Instruments Komplete Start (which is free) should cover most of your needs .
Chip Music (Free) - https://woolyss.com/chipmusic-plugins.php
Chip Music (Paid) - https://www.plogue.com/index.html
Production Suite (Free) - https://www.native-instruments.com/en/products/komplete/bundles/komplete-start/