A [tap](Taps.md) is Homebrew-speak for a Git repository containing extra formulae.
Homebrew has the capability to add (and remove) multiple taps to your local installation with the `brew tap` and `brew untap` commands. Type `man brew` in your terminal. The main repository at <https://github.com/Homebrew/homebrew-core>, often called `homebrew/core`, is always built-in.
* [denji/nginx](https://github.com/denji/homebrew-nginx): A tap for NGINX modules, intended for its `nginx-full` formula which includes more module options.
* [InstantClientTap/instantclient](https://github.com/InstantClientTap/homebrew-instantclient): A tap for Oracle Instant Client. The packages need to be downloaded manually.
* [osx-cross/avr](https://github.com/osx-cross/homebrew-avr): GNU AVR toolchain (Libc, compilers and other tools for Atmel MCUs, useful for Arduino hackers and AVR programmers).