CSS Lint

http://csslint.net/ - CSS Lint

Sequel Pro

http://sequelpro.com/ - Sequel Pro is a fast, easy-to-use Mac database management application for working with MySQL databases

StarUML

http://staruml.io/ - Sophisticated Modeling
Former: http://staruml.sourceforge.net/en/

Astah Community

http://astah.net/editions/community - Astah Community is an add-on tool for your UML that is ready to use the instant you download it, allowing your UML to be quickly and easily enhanced, and refining your development process with Astah's innovative modeling approach

Pencil

http://pencil.evolus.vn/ - Pencil is built for the purpose of providing a free and open-source GUI prototyping tool that people can easily install and use to create mockups in popular desktop platforms

yEd

http://www.yworks.com/en/products_yed_download.html - yEd Graph Editor

Gimp

http://www.gimp.org/ - GIMP is the GNU Image Manipulation Program

WebP

https://developers.google.com/speed/webp/ - WebP is a modern image format that provides superior lossless and lossy compression for images on the web. Using WebP, webmasters and web developers can create smaller, richer images that make the web faster.

ImageMagick

https://www.imagemagick.org/ - Use ImageMagick® to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, JPEG-2000, GIF, TIFF, DPX, EXR, WebP, Postscript, PDF, and SVG.

Meld

http://meldmerge.org/ - Meld is a visual diff and merge tool targeted at developers.

Sphinx

http://sphinx-doc.org/ - Sphinx is a tool that makes it easy to create intelligent and beautiful documentation, written by Georg Brandl and licensed under the BSD license

Calibre

https://calibre-ebook.com/ - calibre - E-book management

HTMLHint

http://htmlhint.com/ - HTMLHint

wkhtmltopdf

http://wkhtmltopdf.org/ - wkhtmltopdf

Eclipse

https://www.eclipse.org/ - An amazing open source community of Tools, Projects and Collaborative Working Groups

IntelliJ IDEA

http://www.jetbrains.com/idea/ - Java IDE with the fastest-growing mindshare

NetBeans

https://netbeans.org/ - NetBeans IDE is FREE, open source, and has a worldwide community of users and developers

Visual Studio Code

https://code.visualstudio.com/ - Visual Studio Code - Code Editing. Redefined

Sublime Text

http://www.sublimetext.com/ - Sublime Text is a sophisticated text editor for code, markup and prose

Lite IDE

https://github.com/visualfc/liteide - LiteIDE is a simple, open source, cross-platform Go IDE

Atom

https://atom.io/ - A hackable text editor for the 21st Century

Light Table

http://www.lighttable.com/ - The next generation code editor

Aptana

http://aptana.com/ - Build web applications quickly and easily using the industry’s leading web application IDE

TextMate

http://macromates.com/ - TextMate brings Apple's approach to operating systems into the world of text editors

Lime Text

http://limetext.org/ - Lime Text is a powerful and elegant text editor primarily developed in Go that aims to be a Free and open-source software successor to Sublime Text

Adobe Brackets

http://brackets.io/ - A modern, open source text editor that understands web design.

Lua Development Tools

https://eclipse.org/ldt/ - Lua Development Tools (LDT) is about providing Lua developers with an IDE providing the user experience developers expect from any other tool dedicated to a static programming language.

ZeroBrane Studio

https://studio.zerobrane.com/ - ZeroBrane Studio is a lightweight Lua IDE with code completion, syntax highlighting, live coding, code analyzer, and debugging support for Lua

Singal

https://signal.org/ - Signal. Fast, simple, secure.

Delta Chat

https://delta.chat/ - The messenger - Delta Chat

Java Decompiler

http://jd.benow.ca/ - The “Java Decompiler project” aims to develop tools in order to decompile and analyze Java 5 “byte code” and the later versions

JITWatch

https://github.com/AdoptOpenJDK/jitwatch - Log analyser and visualiser for the HotSpot JIT compiler

BTrace

https://kenai.com/projects/btrace - BTrace is a safe, dynamic tracing tool for the Java platform

JSLint

http://www.jslint.com/ - The JavaScript Code Quality Tool

JSHint

http://www.jshint.com/ - JSHint, a JavaScript Code Quality Tool

JavaScript Beautifier

http://jsbeautifier.org/ - Beautify, unpack or deobfuscate JavaScript and HTML, make JSON/JSONP readable, etc

Fiddler

http://www.telerik.com/fiddler - The free web debugging proxy for any browser, system or platform

Charles

http://www.charlesproxy.com/ - Charles Web Debugging Proxy • HTTP Monitor / HTTP Proxy / HTTPS & SSL Proxy / Reverse Proxy

Livepool

http://rehorn.github.io/livepool/ - Cross platform debugging proxy for web developers base on NodeJS

UglifyJS

https://github.com/mishoo/UglifyJS - JavaScript parser / mangler / compressor / beautifier library for NodeJS
https://github.com/mishoo/UglifyJS2 - JavaScript parser / mangler / compressor / beautifier toolkit

Closure Compiler

https://github.com/google/closure-compiler - A JavaScript checker and optimizer

JavaScript Debugger

https://addons.mozilla.org/en-US/firefox/addon/javascript-debugger/ - Venkman is the code name for Mozilla's JavaScript Debugger

Javascript Debug Toolkit

https://code.google.com/p/jsdt/ - Debug javascript in ie,firefox,chrome,safari,opera and all browsers support ajax

JavaScript Shell

http://www.squarefree.com/shell/ - A command-line interface for JavaScript and DOM

Regexper

http://www.regexper.com/ - Regular expression visualizer using railroad diagrams

PhantomJS

http://phantomjs.org/ - PhantomJS is a headless WebKit scriptable with a JavaScript API

Foxmail

http://www.foxmail.com/ - Foxmail

Thunderbird

https://www.mozilla.org/en-US/thunderbird/ - Thunderbird — Software made to make email easier. — Mozilla

Enigmail

https://enigmail.net/ - A simple interface for OpenPGP email security

K-9 Mail

https://k9mail.github.io/ - K-9 Mail is an open source email client focused on making it easy to chew through large volumes of email

Mailpile

https://www.mailpile.is/ - Mailpile: e-mail that protects your privacy

Mou

http://mouapp.com/ - The missing Markdown editor for web developers

LightPaper

http://clockworkengine.com/lightpaper-mac/ - LightPaper is a simple, beautiful, powerful yet free Text Editor for passionate writers

Haroopad

http://pad.haroopress.com/user.html - Haroopad is a markdown enabled document processor for creating web-friendly documents

MarkdownPad

https://markdownpad.com/ - MarkdownPad is a full-featured Markdown editor for Windows

MDwiki

http://dynalon.github.io/mdwiki/ - MDwiki is a CMS/Wiki completely built in HTML5/Javascript and runs 100% on the client

GitBook

https://www.gitbook.io/ - GitBook · Write & Publish Books

Typora

https://typora.io/ - Typora — a minimal markdown editor, markdown reader.

VLC

https://www.videolan.org/vlc/index.html - Official download of VLC media player, the best Open Source player - VideoLAN

FreeMind

http://freemind.sourceforge.net/wiki/index.php/Main_Page - FreeMind is a premier free mind-mapping software written in Java

XMind

http://www.xmind.net/ - The Most Popular Mind Mapping Tool

Open Office

http://www.openoffice.org/ - The Free and Open Productivity Suite

Libre Office

https://www.libreoffice.org/ - LibreOffice is a powerful office suite

Neo Office

https://www.neooffice.org/ - Stable and secure office suite software for Mac OS X

Homebrew

http://brew.sh/ - The missing package manager for OS X

npm

https://www.npmjs.org/ - Node Packaged Modules

Jenv

http://jenv.io/ - jenv is Java environment manager, and it is a clone of RVM for Java

jEnv

http://www.jenv.be/ - jEnv is a command line tool to help you forget how to set the JAVA_HOME environment variable

RubyGems

https://rubygems.org/ - your community gem host

RVM

https://rvm.io/ - RVM is a command-line tool which allows you to easily install, manage, and work with multiple ruby environments from interpreters to sets of gems

GVM

http://gvmtool.net/ - the Groovy enVironment Manager

GranttProject

http://www.ganttproject.biz/ - GanttProject is a cross-platform desktop tool for project scheduling and management

OpenProj

http://www.openproject.org/ - Efficiently plan, steer, and communicate within your projects

ProjectLibre

http://www.projectlibre.org/ - Open source replacement of Microsoft Project

TrueCrypt

https://truecrypt.ch/ - TrueCrypt.ch is the gathering place for all up-to-date information
Former: http://truecrypt.sourceforge.net/

VeraCrypt

http://www.veracrypt.fr/ - VeraCrypt - IDRIX: Cryptography and IT Security Experts

OpenPGP.js

http://openpgpjs.org/ - OpenPGP JavaScript Implementation

Whiteout.io

https://whiteout.io/ - Encryption for the rest of us

miniLock

https://minilock.io/ - File encryption software that does more with less

GnuPG

https://www.gnupg.org/ - The GNU Privacy Guard

OpenKeychain

https://www.openkeychain.org/ - OpenKeychain for Android helps you communicate more privately and securely, compatible with the OpenPGP standard.

Remark

https://github.com/gnab/remark - A simple, in-browser, markdown-driven slideshow tool

Impress.js

https://impress.github.io/impress.js/ - presentation tool based on the power of CSS3 transforms and transitions in modern browsers

HTML5 Slides

https://code.google.com/p/html5slides/ - A Google HTML5 slide template

Marp

https://yhatt.github.io/marp/ [github] - Markdown presentation writer, powered by Electron.

reveal.js

https://github.com/hakimel/reveal.js - A framework for easily creating beautiful presentations using HTML

H5Slides

http://jinjiang.github.io/h5slides/ source - H5Slides希望通过HTML5的技术,成为用户编辑、播放、控制幻灯片这一系列行为的全套方案的提供者。

Homebrew

http://brew.sh/ - Homebrew

The missing package manager for macOS http://brew.sh

osquery

https://osquery.io/ - osquery allows you to easily ask questions about your Linux, Windows, and OS X infrastructure.