A universal document converter -- Pandoc

Pandoc is a powerful document conversion tool, it is called swiss-army knife in this field. It understands many document formats, like markdown, ms word, pdf, html, etc. And it is free, you may install it as a command tool or try it online.

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Tools to manage code snippets

2 apps to manage your code snippets in local machine: massCode and SnippetStore. Both tools are open source apps with different features. You can choose one according your needs.

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A tool to learn Git

LearnGitBranching is an online tool that provides an visual and interactive way to learn Git. It is a pure clientside application written in JavaScript, only an HTML page with some JS and CSS, there's no AJAX requests. Just open it in a browser and you are ready to use it. It offers various levels for you to challenge. See more on its GitHub repository.

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A tool showing cheatsheet for programming languages and Linux commands

cheat.sh is a pretty useful tool that provides a cheat sheet for all you need like Linux commands, programming languages and DBMSes. You can use it to display usages of a Linux command, a code snip of a programming language like code for looping an array with PHP. For the moment, it covers 56 programming languages(C, awk, bash, PHP, Python, Perl, R, Ruby, JS, Go, Swift...) and 1000+ Linux commands.

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Unix style terminals for Windows

If you need to run commands on Windows, it would be a much better choice to use an Unix style terminal to replace default Windows console. Here it introduces some good of them, like Git for Windows, Cmder, and a more powerful one Cygwin.

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