Vital is a free and powerful spectral warping wavetable synthesizer with a well built and intuitive visual interface despite its complex possibilities: This might be a great starting point even if you’re new to sound synthesis.

A must have !

Gatelab is a gate sequencer and volume modulation generator designed to add rythmic movement to static pads, drones, basslines & more.

You can customize the modulation sequence or use its randomize functions to create all sorts of unexpected riffs and patterns.

s(M)exoscope is a free oscilloscope that allows you to visually monitor audio waveforms:

This is a must to check the low frequencies phase interactions between your kick and bass for instance, and get a strong, consistent low end.

bx_subfilter is a free plugin designed to add clarity and definition to low-end:
by cleaning up the extreme low and help controlling the sub-bass while boosting a target frequency range.

There are various applications in which you can use it, including strengthening a bassline’s fundamental frequency based on its key.

With its 14 different modes, Supermassive is a must-have freeware designed to generate massive delays, lush reverbs and never-ending soundscapes:

Use it to create luscious clouds of reverb, otherworldly delays, and swelling waves of feedback unlike any you’ve heard before.

A1TriggerGate gate sequencer is a free plugin specifically designed to transform static audio signals and breath life into dull sounds.

DJM Filter plugin provides a Pioneer DJM Mixer filter emulation in a dual LOWPASS/HIGHPASS filter module – all in one slick control that sounds great and can easily be automated within your DAW.

Fracture is a versatile effects processor designed to add glitchy articulations and abstract textures to your sounds: Use it on anything from drums to synth lines or vocals for creative results.