brew install phoenixthrush/homebrew-tools/<formula>

Or brew tap phoenixthrush/homebrew-tools and then brew install <formula>.

Or, in a brew bundle Brewfile:

tap "phoenixthrush/homebrew-tools"
brew "<formula>"

• tcc: Tiny C Compiler for x86, x86-64, and ARM.

  # tcc already exists in homebrew-core
  brew install --HEAD --formula phoenixthrush/homebrew-tools/tcc

• filius: Filius is a network simulator for educational purposes.

  brew install --HEAD --formula filius

• johnny: Johnny is a simulator of a simple (virtual) von-Neumann Computer.

  brew install --HEAD --formula johnny

• feishin: A modern self-hosted music player.

  brew install --cask feishin

brew help, man brew or check Homebrew's documentation.