name/word/description generators:

• http://www.fantasynamegenerators.com/
• http://www.rinkworks.com/namegen/
• http://www.typeprofessor.com/pangrams.html
• https://www.seventhsanctum.com/index.php
• http://watchout4snakes.com/
• http://akana.conlang.org/tools/awkwords/

other/visual generators:

• https://donjon.bin.sh/scifi/world/
• http://ship.shapewright.com
• https://www.beaudu.com/spritedraw

generator-makers:

• http://www.generatorland.com/default.aspx

tools:

• http://www.mrinitialman.com/OddsEnds/Sizes/compsizes.xhtml (comparing human heights)
• https://krikienoid.github.io/flagwaver/

online stores:

• https://www.stimtastic.co (stim stuff for autism, adhd, spd, etc.; i have personally ordered many things from here before, all being at low cost and high quality, so i definitely recommend!)

games/fun/calming:

• http://www.windows93.net/
• http://www.interactivebuddy1.org/
• https://neave.com
• http://www.coolmath-games.com/0-bloons-tower-defense-3
• https://www.kongregate.com/games/herointeractive/bubble-tanks-3
• https://mynoise.net/ (ambiance maker; very very useful for relaxation, sleep, studying, etc.)

converters:

• https://www.rot13.com/
• https://www.online-convert.com/ (has a LOT of options for both sound files and video files)

misc interesting:

• https://libraryofbabel.info/
• http://orteil.dashnet.org/
• http://dotsarecool.com/rgme/tech/gen1cries.html (Gen I Pokemon cries)
• https://ncase.me/trust/
• https://simulationcorner.net/index.php?page=sam (simulates the SAM Commodore 64 text to speech)