A big list of useful tools or resources I sometimes use when solving or writing puzzles.

Core Puzzling Resources

Searching for Words and Phrases

• Qat: Great for certain types of wordplay restrictions. Dictionaries are limited though.
• Onelook
• Nutrimatic
• Regex Dictionary (Visca)
• Wikipedia Regex Search (Crossword Nexus)
• [Requires programming] Datamuse API

Word Puzzles

• Iterative Anagram Solver
• Crossword Heaven: For searching crossword clues/answers.
• wordplays.com: For searching crossword clues/answers.
• [Paid] Xword Info: For searching New York Times crossword clues/answers.

Logic Puzzles

• puzz.link
  • puzz.link/list.html: For solving/creating specific logic puzzle genres.
  • puzz.link/db/: For logic puzzles to solve.
• Noq: Solver for various logic puzzle types.
• penpa-edit: For general logic puzzles.

Other Resources

• Yandex Image Search: Often useful when Google's reverse image search fails.
• CJ's Dropquote Solver
• dcode.fr Word Search Solver
  • Other tools on dcode.fr are useful as well, such as decoders for ciphers
• qhex: Various tools
• /dev/joe's MIT Mystery Hunt Index

Collaboration Tools

• Google Sheets
• Aggie.io: Collaborative drawing

Domain-specific Tools

Mathematics

• WolframAlpha
• Integer factorization calculator (Alpertron)
• Desmos: Online graphing calculator.
• Geogebra: Online graphic calculator + geometry tool.

Programming

• Try It Online: Interpreters for a large number of languages, including esoteric ones.
• Regex101: For debugging/explaining regular expressions.

Music

• Online Sequencer

Languages

• Shapecatcher: Draw to convert to a Unicode character.
• jisho: Japanese dictionary. Supports search by radical or drawing.
• InputKing: Online IME for various languages.

Art and Design

• Identifont: Font identification.
• WhatTheFont: Font identification.

Data Sets

Wordlists

• Peter Broda's Wordlist (ranked)
• RankedWiki (Wikipedia/Wiktionary entries, ranked)
• spread the word(list) (ranked)