Recommended and mentioned products
Find your audio's true perceived loudness to prepare for TV and streaming services.
Youlean Loudness Meter - absolutely essential if you plan on releasing your music on Spotify/Apple Music etc. Pro version is on sale right now too, but you can do everything you need with the free one.
Vital is a spectral warping wavetable synthesizer with drag'n'drop modulation workflow and animated preview of the synth's inner workings where needed. Comes with many modulation sources (including audio-rate), MPE support and FX chain.
Vital - Basically a free Serum equivalent. A very powerful synth.
Auto-tune made simple and funny for everyone
If you like to sing, voloco is cool. their phone app is way better, and honestly it's more of a toy than anything else. but it's free and I recommend checking it out!