Give it a temperature and a humidity and it tells you whether condensation will form, how cold a surface has to get before it does, and the point where mold starts becoming a problem.
A Soft MurmurLayer rain, waves, and distant thunder into your own ambient mix.
Acapella ExtractorPull the vocal out of a track. Crude, free, oddly fun.
Anki WebSpaced repetition flashcards. The most effective memorization tool.
Archive TodaySave any web page permanently. Useful when articles disappear.
AzbukaFree Russian course from the alphabet up: letters, sounds, words, phrases, grammar and slang, with real audio for every word. Grade bands K–2 through 12, plus adults.
BillfoldMake a proper invoice with line items, tax and terms, then download it free. Built for people who bill their own clients.
BitwardenOpen-source password manager. Free, trustworthy, works everywhere.
CadencePaste anything you wrote and see its shape — a bar for every sentence, tall for the long ones and short for the short. A flat row means it all sounds the same, which is hard to spot from inside your own writing.