DC1A: no-fuss compressor (great for vox)
IVGI: rich, modelled distortion
MJUC jr.: equally no-fuss compressor
TENS jr.: slick spring verb
Compressor: transparent and fine-tunable
Equalizer 2: smooth and fully-featured
Splitter: handy utility
Lese Codec: contemporary bitcrusher
Tritik Krush: classic bitcrusher (with a solid overdrive)
Valhalla Super Massive: classic, vast reberb (try the presets)
SoundOnSound: Mixing to a Pink Noise Reference
3DSourced: 44 Common 3D Print Problems
WebAIM Contrast Checker (try the site checker too)
Photopea: fun-sized photoshop