MusicBrainz Picard is a cross platform music tag editor that provides support for a wide number of formats. It’s not difficult to use and provides advanced options and plugins that you can add. On its own the program runs fine however, and makes tagging music files easy.
Bluefish is an open source programming and web development application. Developed by the Bluefish team, it gives you plenty of options for writing scripts, websites and even code. While the program is powerful, it is lightweight and loads quickly even on a netbook. However, don’t mistake the compactness for lack of features, as this is packed.
Aquamacs is a distribution of the well-known and powerful Emacs text editor. Developed by David Reitter, it looks just like a Mac app and runs like one. However, it retains the power of GNU Emacs. In short, it brings you the power of Emacs as well as the configurability but with an easier to use interface.
Kompozer is a free web authoring tool that offers a complete set of features for WYSIWIG editing of web pages, web file management and performing other tasks. As envisioned by the Kompozer team, it’s a fully furnished system but easy to use, and ideal for non-technical people who want to produce a professional looking site without needing to learn coding.
Brackets is a free open source web development tool designed for front end developers and professional web designers. While there are plenty of web editors around, Brackets differs because it combines all the essential tools in the editor as you’re coding. It also saves all the changes you make automatically without the need to reload, but there’s more.
Firebug is a free web development tool that when integrated with Firefox, gives you access to a wide range of web development tools that you can use while browsing. With this tool, you can debug and edit, track CSS, JavaScript and HTML regardless which web page you are in.
Okular is a free cross platform document reader. Developed by the Okular Team, it is a universal reader that can run on multiple platforms including Windows, Mac, Linux and BSD among others. Unlike other so-called document readers that support only PDF and a few other formats, Okular has wide ranging format support.
Nook is a free book reader from Barnes and Noble which you can use not just for books but for magazines, newspapers and other reading materials online. With it you can download free ebooks and also make purchases, and there’s a good amount of customization available although it works fine with the default settings.
Zim is an open source text editor that you can use to take down notes and gather your thoughts. Developed by the Zim Wiki Team, it is easy to use and powerful editor that lets you to set up and link wiki pages. If you're tired of the very basic notepad that comes with your OS, then give this a try.
