Gulp

• gulp-ruby-sass
• gulp-autoprefixer
• gulp-minify-css
• gulp-jshint
• gulp-concat
• gulp-uglify
• gulp-imagemin
• gulp-livereload (requires tiny-lr)
• gulp-clean
• gulp-cache

• gulp-notify

• gulp-header (headers in files)
• gulp-mocha
• gulp-stylus
• gulp-compass
• gulp-nodemon
• gulp-size (displays size)

Example

// gulpfile.js
// Load plugins
var gulp = require('gulp'),
    sass = require('gulp-ruby-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    minifycss = require('gulp-minify-css'),
    jshint = require('gulp-jshint'),
    uglify = require('gulp-uglify'),
    imagemin = require('gulp-imagemin'),
    rename = require('gulp-rename'),
    clean = require('gulp-clean'),
    concat = require('gulp-concat'),
    notify = require('gulp-notify'),
    cache = require('gulp-cache'),
    livereload = require('gulp-livereload'),
    lr = require('tiny-lr'),
    server = lr();

// Styles
gulp.task('styles', function() {
  return gulp.src('src/styles/main.scss')
    .pipe(sass({ style: 'expanded', }))
    .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))
    .pipe(gulp.dest('dist/styles'))
    .pipe(rename({ suffix: '.min' }))
    .pipe(minifycss())
    .pipe(livereload(server))
    .pipe(gulp.dest('dist/styles'))
    .pipe(notify({ message: 'Styles task complete' }));
});

// Scripts
gulp.task('scripts', function() {
  return gulp.src('src/scripts/**/*.js')
    .pipe(jshint('.jshintrc'))
    .pipe(jshint.reporter('default'))
    .pipe(concat('main.js'))
    .pipe(gulp.dest('dist/scripts'))
    .pipe(rename({ suffix: '.min' }))
    .pipe(uglify())
    .pipe(livereload(server))
    .pipe(gulp.dest('dist/scripts'))
    .pipe(notify({ message: 'Scripts task complete' }));
});

// Images
gulp.task('images', function() {
  return gulp.src('src/images/**/*')
    .pipe(cache(imagemin({ optimizationLevel: 3, progressive: true, interlaced: true })))
    .pipe(livereload(server))
    .pipe(gulp.dest('dist/images'))
    .pipe(notify({ message: 'Images task complete' }));
});

// Clean
gulp.task('clean', function() {
  return gulp.src(['dist/styles', 'dist/scripts', 'dist/images'], {read: false})
    .pipe(clean());
});

// Default task
gulp.task('default', ['clean'], function() {
    gulp.start('styles', 'scripts', 'images');
});

// Watch
gulp.task('watch', function() {

  // Listen on port 35729
  server.listen(35729, function (err) {
    if (err) {
      return console.log(err)
    };

    // Watch .scss files
    gulp.watch('src/styles/**/*.scss', ['styles']);

    // Watch .js files
    gulp.watch('src/scripts/**/*.js', ['scripts']);

    // Watch image files
    gulp.watch('src/images/**/*', ['images']);

  });

});

References

https://github.com/gulpjs/gulp/blob/master/docs/getting-started.md#getting-started

Livereload

var lr = require('tiny-lr')();

function notify (lr, root) {
  return function (event) {
    var fname = require('path').relative(root, event.path);
    lr.changed({ body: { files: [ fname ] }});
  };
}

gulp.task('livereload', function () {
  lr.listen(35729)
  gulp.watch('public/**/*', notify(lr, __dirname+'/public'));
});

// Express
app.use(require('connect-livereload')())
<!-- livereload --><script>document.write('<script src="'+(location.protocol||'http:')+'//'+(location.hostname||'localhost')+':35729/livereload.js?snipver=1"><\/scr'+'ipt>')</script>