Free VSTs Effects
Klangheim
DC1A: no-fuss compressor (great for vox)
IVGI: rich, modelled distortion
MJUC jr.: equally no-fuss compressor
ZL Audio
Compressor: transparent and fine-tunable
Equalizer 2: smooth and fully-featured
Other
Lese Codec: contemporary bitcrusher (sorta)
Tritik Krush: classic bitcrusher (with a solid overdrive)
Valhalla Super Massive: classic, vast reberb (try the presets)
Tips and Tricks
Audio Production
SoundOnSound: Mixing to a Pink Noise Reference
3D Printing
3DSourced: 44 Common 3D Print Problems
Web Tools
WebAIM Contrast Checker (try the site checker too)
Map2Model: generates printable 3D maps