What site-specific post formatting settings are available?

Certain Stack Exchange sites have specialized support for non-standard types of post formatting.

• Balsamiq Mockups: Displays mockups for user interfaces
  • User Experience
• Card renderer: Displays card hands
  • Poker
• Chess Replayer: Display chess positions and games
  • Chess
• CircuitLab schematics: Displays and simulates electrical circuits
  • Electrical Engineering
• Cross-site internal links: Translate question URLs from any SE site into question titles
  • Meta Stack Exchange
• Furigana: support for Japanese phonetic annotations
  • Japanese Language, Anime & Manga
• Go board renderer: Displays Go boards
  • Board & Card Games
• Highlight.js: Provides syntax highlighting for code
  • Stack Overflow and some other technical sites
• jTab and ABCjs: Rendering of sheet music and guitar tabs
  • Music Practice & Theory
• Magic: The Gathering Autocard links: Automatic links to MTG cards on the official website
  • Board & Card Games
• MathJax/LaTeX: Display advanced mathematical formulas
  • Cross Validated, Electrical Engineering, Mathematics and many more sites
  • Certain sites have special configurations for MathJax:
    • The mhchem extension has been enabled on Chemistry and some other sites, noted in the list of sites with MathJax linked above.
    • Some sites use \$ delimiters to denote MathJax instead of the normal $; these sites are also noted in that list.
• SoundCloud embedding: Embed music from SoundCloud
  • Code Golf, Music Practice & Theory, Signal Processing, Video Production
• YouTube embedding: Embed YouTube videos
  • Arqade, Movies & TV, Music Practice & Theory, SciFi & Fantasy and many more sites