VST Plugins (FOSS)

Samplers

juicysfplugin - Soundfont 2

Ninjas2 - Slicer

Synths

Vital - Various

FX

Airwindows - Various

Socalabs - Various

Retro

Magical 8bit Plug 2 - Retro

OPNplug - OPN2, OPL2

SID - C64

from LMMS

Vital - Bitinvader, LB302

Kickmess - Kicker

Zyn-Fusion - ZynAddSubFX

Wolf Shaper - Waveshaper

Castello Reverb - ReverbSC

Socalabs - SID, PAPU and Spectrum Analyzer

from FL Studio

Ninjas2 - Fruity Slicer

Kickmess - Fruit Kick

Vital - SimSynth

mda DX10 - Fruity DX10

Airwindows Weight - Fruity Bass Boost

Dragonfly Reverb - Fruity Reeverb & Fruity Reeverb2

Spectrum Analyzer - Fruity Spectroman

StereoProcessor - Fruity Stereo Enhancer

Wolf Shaper - Fruity Waveshaper

SupaPhaser - Fruity Phaser

VST Plugins (Proprietary/Nonfree)

Spaceship Delay

Synths

Europa

from FL Studio

Image-Line VST

GVST - Tuner