Light Table is an open source integrated development environment. Light Table support Clojure, ClojureScript, Python, HTML, JavaScript, CSS and it is extensible via plugin for another language. Light Table is available for 32 dan 64 bit Linux. I will show how to install it in Ubuntu 15.04 then create menu icon and Launcher in Unity desktop.

If you are looking for a free and complete application to create and edit PDF file on Linux, you might interested in Master PDF Editor. Although it's not an open source software, you can use it freely for non commercial purposes. It supports PDF and XPS files, you can add, edit, import image to the document. You can also add and edit text inside the document. Page related tasks is also supported by Master PDF Editor, you can add and remove pages from the document. Another wonderful features which come with Master PDF Editor is an ability to add various controls such as buttons, text fields, checkboxes and more, as well as implement event handlers for predefined user actions such as pressing, clicking, hovering, and scrolling.

Komodo Edit is a fast, smart, free, and open source code editor based on award winning Komodo IDE. It runs on Windows, Linux and Mac OSX and supports many programming language PHP, Python, Ruby, JavaScript, Perl, Tcl, XML, HTML 5, CSS 3, and more. Komodo Edit also supports customizable syntax coloring, folding, intelligent autocomplete, remote file supports and more!

Well, if you are familiar with VLC Media Player and love it, you should give VLMC (VideoLAN Movie Creator) a try when making video. VLMC is created by VideoLAN team.

VideoLAN Movie Creator is a non-linear editing software for video creation based on libVLC and running on Windows, Linux and Mac OS X! It is a free software distributed under the terms of the GPL v2.

No matter what desktop environment you use, Gnome, LXDE, XFCE or Unity, MenuLibre can easily edit their menu easily. MenuLibre is an advanced menu editor which provides modern and easy-to-use interface. MenuLibre - simply - is a one-stop menu editor for Linux operating system.

Well, before we jump deeper into the application, please let me quote the definition of Markdown taken from Wikipedia:

Markdown is a lightweight markup language, originally created by John Gruber and Aaron Swartz allowing people "to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML)". The language takes many cues from existing conventions for marking up plain text in email.