Guard::FastSpec automatically run your specs (much like autotest).

Guard::Jetty automatically starts/restarts your jetty server when needed.

Guard your forms with class (or any other selectors)

Guard test files for Spork-owned MiniTest

Guard::Treetop automatically compiles your treetop grammars

guard gem for koans

Converts file.html.haml into file.html.erb

Better Guardfile syntax

GuardDog.

Guard::Ragel automatically rebuilds ragel .rl files into their corresponding .rb files

Sorts YAML files alphabetically by key.

asciidoctor guard

Guard plugin for the invoker process management utility.

Guard::Teaspoon automatically runs your Javascript tests with all the features of Teaspoon.

Guard::ZeusClient automatically runs a zeus command (test by default) when your files change. Does not run zeus server.

Guard for fixture_builder

Guard::Minitest automatically run your tests with MiniTest framework (much like autotest)

Guard::Ruby is for running simple ruby files that don't necessarily have a separate test file or predictable pass/fail output, such as benchmarks.

Guard::Rna automatically builds node.json files.

Guard plugin for smart, automatic compilation of your Javascript template files into usable Javascript