Bass Grinder Free
control the bass section
Bitwig 8-Track | u-he Beatzille | Ubuntu Studio
ISOL8
Mix monitoring tool that divides the frequency range into 5 bands
kawaChord2 free
Handy for quickly entering chords
MfreeEffectsBundle
amazing effect bundle
Plogue Alter Ego + 3 Soundbänke
Protoplug
missing link for Lua scripts
Throb
Open source plugin that generates clock/reset signals synchronised with the host tempo
VCV Rack
Open-source virtual modular system