Tools to download
GIMP - images
Audacity - audio editing
Riddles and Puzzles
The Daily SuDoku
Had To Play On Forums
The Master Theorem
Puzzles - Sudoku and Gogen Solutions
Clueless Crosswords - Solve a Puzzle
LogicProblems and Solutions
MIT Mystery Hunt:
Mystery Mystery Hunt List of Puzzles
At the Crossroads
God's Gift to Cartooning
General Riddle and Cipher Help Sites
Nordinho.net Community
Red Luth
Purple Hell
- archived but bits still work
https://www.geocachingtoolbox.com/
https://www.dcode.fr/en
https://www.mytecbits.com/tools/
https://www.omniglot.com/
Anagrams
Andys anagram solver
http://dictionary.sensagent.com/
Word tools
Crossword Solver
Connections - before and after
Numbers
Base-N Calculator
Base64 Decode and Encode
Thai numerals - Wikipedia
Hex Calculator and other calculators
ASCII hex decimal
http://datagenetics.com hex words
https://numbersdb.org/
Maths
https://www.rapidtables.com/
https://quickmath.com/
Colours and Images - also see GIMP
https://imagecolorpicker.com/
http://imgops.com/
https://imagecolorpicker.com/
http://exif.regex.info/exif.cgi
https://futureboy.us/stegano/decinput.html
Other
Latitude and Longitude Finder
Keyboard Conversions
Can you talk Brummie rhyming slang?