Backmask is really a one of a kind plugin described as ‘a chaotic reverser that uses government approved paradox processing technologies‘... well it’s really fun and creative, just give it a try !
In fact the plugin is sold $20 but there’s a trick: You can legally STEAL it on the developer’s website !

Mishby is a chaotic audio mangling plugin: If you’re on a lookout for unconventional and weird audio effects, this is it.
Again, you’ll have to hit the STEAL button on the developer’s website to get it for free !

Vendaval is an audio generator that recreates the sounds of wind using pink noise combined with various processing: It features 4 different algorithms to model different aspects of air in motion

Rand (formerly Push) is a generative synth sound module that will create a new patch every time you hit the middle button.
You can then edit any preset parameters to fine-tune the sound you generated.

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.

Freshly released few days ago, this bitcrusher with interesting features can degrade the signal and modulate the pitch to help you get the color of old samplers and vintage records.

Filterstep is a creative multi-mode filter effect with a built-in step sequencer. Optimized for creating complex and evolving movement, it shines at adding interest to boring sounds.

Rift Filter Lite is a morphing filter plugin that offers a lot of interesting features and plenty of filtering modes: It’s currently available for free only for a LIMITED TIME, so don’t miss out !