##HTML&CSS autoprefixer - parse CSS and add vendor prefixes to rules by Can I Use.

gulp-browser-sync - keep multiple browsers & devices in sync when building websites.

gulp-useref - parse build blocks in HTML files to replace references to non-optimized scripts or stylesheets.

gulp-email-design - a workflow for designing and testing HTML email templates.

gulp-uncss - remove unused CSS from your projects.

gulp-csso - very cool CSS minificator. In addition, there are many CSS optimizers and benchmark tests (GitHub) for them. But recently I saw most powerful Shorthand utility and gulp-shorthand, which does folowing:

a {
	font-family: Arial;
	font-style: italic;
	font-size: 14px;
	line-height: 18px;
	font-weight: bold;
	background-image: url('example.png');
	background-color: red;
	background-size: cover;
	background-repeat: no-repeat;
}

=>

a {
  font: italic bold 14px/18px Arial;
  background: red url('example.png') no-repeat / cover;
}

gulp-htmlmin - neat HTML minificator.

gulp-csscomb - refines the structure of your CSS.

gulp-csslint - CSS linter.

gulp-htmlhint - HTML validator using htmlhint

gulp-htmllint - HTML validator using htmllint

gulp-processhtml - Process html files at build time to modify them as you wish.

gulp-myth - Postprocessor that polyfills CSS

##JavaScript gulp-autopolyfiller - precise polyfills. This is like Autoprefixer, but for JavaScript polyfills.

gulp-babel - transpiler for writing next generation JavaScript.

gulp-jsfmt - for formatting, searching, and rewriting JavaScript.

gulp-jscs - Check JavaScript code style with jscs.

gulp-modernizr - build out a lean, mean Modernizr machine.

gulp-express — start (and supervise) an Express.js web server using, works well with socket.io

gulp-requirejs and gulp-browserify - optimize the work with RequireJS and Browserify respectively.

gulp-plato - generate static analysis reports.

gulp-complexity - evaluates code maintainability using Halstead and Cyclomatic metrics.

fixmyjs - automatically fix silly lint errors with help of JSHint (gulp-jshint).

gulp-jscpd — copy/paste detector for programming source code.

gulp-buddy.js - magic number detection for javascript.

gulp-jsonlint - JSON validator.

gulp-uglify - JavaScript compressor.

gulp-concat - concatenate files.

gulp-standard - Check JavaScript code style with Standard.

###Unit Tests

##Graphics gulpicon - mystical CSS icon solution.

gulp-iconfont - SVG to webfont converter.

gulp-responsive - produce images at different sizes for responsive websites.

gulp-sharp - fastest module for work JPEG, PNG, WebP and TIFF images.

gulp-svgstore - merge SVGs from a folder.

gulp-imacss - application and library that transforms image files to data URIs.

gulp-imagemin и gulp-tinypng or fimage compression.

gulp-spritesmith - converting a set of images into a spritesheet and corresponding CSS variables.

##Others

gulp-grunt - able to run Grunt tasks from Gulp.

gulp-watch — run tasks whenever watched files change.

gulp-notify - automatic error messages in system notifications center when Gulp tasks fail.

gulp-git - able to use Git commands.

gulp-jsdoc - generate JavaScript documentation by running JSDoc3.

gulp-rev - static file asset revisioning through content hashing.

gulp-bump - increments versions in package JSON and gulp-update, which automatically updates packages.

main-bower-files - inject Bower packages.

gulp-removelogs - remove console logging statements.

gulp-preprocess - preprocess files based off environment configuration.

gulp-duration — displays the elapsed execution time of Gulp tasks.

gulp-changed and gulp-newer — run Gulp tasks with only those source files modified since the last successful run.

gulp-connect - simple static web server.

gulp-shell - run Shell commands.

gulp-ssh - provides the ability to connect via SSH and SFTP.

gulp-zip - compress files and folders..

gulp-clean and gulp-copy - respectively remove and copy sources.

gulp-replace - Search and replace strings in text files.

gulp-filesize - displays sizes of files in a readable format.

gulp-util - utilities for developing Gulp plugins.

gulp-plumber - prevents pipe breaking caused by errors from gulp plugins

gulp-data - Generate a data object from a variety of sources: json, front-matter, database, anything. Compatible with many plugins including gulp-jade and gulp-swig

gulp-props - Convert Java .properties files to JSON

gulp-todo - Generate a TODO.md from todos & fixmes in your code

gulp-markdown - Markdown to HTML with marked

gulp-gh-pages - Publish contents to Github pages

gulp-load-plugins - Automatically load any gulp plugins in your package.json

gulp-sourcemaps - Source map support

##Compilers

##Finally

  • psi - PageSpeed Insights with reporting.
  • tmi - TMI (Too Many Images) - discover your image weight on the web.
  • ngrok - Introspected tunnels to localhost.
  • pageres - responsive website screenshots.
  • matchdep - filter npm module dependencies.
  • Maybe some automatization methods you want to use directly in the editor, so look at the The Best Plugins for Sublime Text.