1. Nagios for Monitoring - This app is for free. Its license status is GPL. The app lies inactive on your computer system monitoring host resources and network services with the aim of notifying the admin in the event a problem arises. You can download the app from www.nagios.org
2. GIT for Version control- As cited on techradar.com, this app is for free. Its license status is GPLv2. After becoming the default revision control system for the kernel, the app has gained popularity and become easier than ever owing to sites like Github. You can download the app from www.git-scm.com
3. GIMP - This app is for free. Its license status is GPL. The app is well known and comes as a standard on most distributions. There are books that are being written about it and it is quite often offered as the free alternative to Adobe’s Photoshop. It has three striking features which include –
a) A very robust set of tools, providing support for everything from sub-pixel sampling and custom brushes for painting, right through to advanced manipulation tools such as layers, channels and transformable paths.
b) It comes with a versatile plug-in and extension system allowing any task to be automated using a simple script that can be written once and then executed with ease by a majority of users.
c) The app has an active community of developers meaning that even where Gimp lacks important features, work is constantly ongoing to extend it and make it the best tool possible. You can download the app from www.gimp.org
4. VirtualBox for Virtualisation - This app is for free. Its license status is GPLv2. Owing to its guest additions package, the app is well integrated to the host system and very fast. This makes it quite simple to spin-up a new virtual machine with its GUI along with command line and remote configuration tools. You can download the app from www.virtualbox.org
5. World of Goo - This app is priced at $20 and is proprietary. A physics-based construction and puzzle game that’s become widely regarded as one of the best indie games of the past decade. It features beautifully drawn, cartoonish graphics that are cheerful, uplifting and timeless. All it involves is dragging Goos together to form a structure, but it’s addictive and lots of fun. The app can be downloaded the app from www.2dboy.com/games.php
6. Money Dance - This app is priced at $49.99 and is proprietary. The app helps you to stay on top of your finances. The app is very easy and provides a clear overview of upcoming bills, the status of various budgets (which it helps you to create) and informative graphs and reports. You can download the app from www.moneydance.com
7. Eclipse IDE – This is a free app. Its license status is Eclipse Public. The app is an excellent, stable IDE. The Content Assist feature of the app that uses auto-complete methods, types and fields, is great for forgetful coders or those working on complex codebases. The app also has automatically enforced coding styles and copy and paste traces making it perfect for team development. You can download the app from www.eclipse.org/eclipse/index.php
8. Tomboy – Organiser – This is a free app and its license status is LGPL. This app is a little cool for collecting and organizing notes. It provides support for basic formatting and has automatic saving. The app makes managing to-do lists or organising research notes on a complex project really simple. You can download the app from www.projects.gnome.org/tomboy
9. Selinux –Security – This is a free app and its license status is GPL. This app is integrated with Linux 2.6 allowing it to be configured to restrict resources available to users, programs and daemons very effectively. You can download the app from www.selinuxproject.org/page/Main_Page.
10. Deja-Dup -Back-up tool – This is a free app and its license status is GPLv3. This app is a very simple tool for carrying out backups automatically and off-site. Its interface has two buttons and the configuration details are straightforward supporting a great range of backup locations including Amazon S3, SSH and Windows Shares. You can download the app from www. live.gnome.org/DejaDup .
11. Chromuim - Web browser – This is a free browser and its license status is BSD. Google Chrome allows you to do many things in a better way compared to many other applications. The interface is kept free of tabs. All the tabs are in the title bar allowing you to focus on the content better. It is the fastest among all the browsers.
12. Ubuntu Software Centre – This is a free app and its license status is GPL. It goes to a certain extent in making Linux repositories as pleasant as other trendy ‘app’ stores that have appeared recently. You can download the app from www.ubuntu.com/ubuntu/features.
13. Amnesia The Dark Descent – This is a proprietary app and is priced at $20. This is the scariest survival horror game ever to have been made. You can download it from www.amnesiagame.com .
14. Pencil – Animation – This is a free app and its license status is GPL. The app makes traditional, hand-drawn animations along with bitmap and vector images. The finished animations can be exported as PNG or Flash. You can download this app from www.pencilanimation.org.
15. IRSSI -IRC client – This is a free app and its license status is GPL. This app helps you in freeing yourself from getting stuck on the command line. You can download the app from www.irssi.org
16. EMACS -Text editor - This is a free app and its license status is GPLv3. It is not only the most popular editor but also also a mail and news reader, project planner, calendar and much more. You can download the app from www.gnu.org/software/emacs.
17. Artha –Thesaurus - This is a free app and its license status is GPLv2. An off-line thesaurus based on WordNet. It can look up selected text at the press of a button and provides synonyms, antonyms, causes and much more. You can download the app from www.artha.sourceforge.net/wiki.
18. Banshee - Media player – This is a free app and its license status is MIT. This is a great media player with support for audio and video in any format. It is also a great support for portable devices. You can download the app from www.banshee.fm.
19. ZSNES -SNES emulator – This is a free app and its license status is GPLv2. This is an excellent emulator to run your favorite games, from Mario to Street Fighter to Final Fantasy. You can download the app from www.zsnes.com.
20. Empathy- Messaging program – This is a free app and its license status is GPL. This app allows you to chat with your friends irrespective of the platform they choose. The app supports a broad range of features on multiple networks that includes voice and video calling. You can download the app from www.live.gnome.org/Empathy.
21. Shotwell – Photo manager – This is a free app and its license status is LGPL. This is a stable and feature-rich photo manager. It automatically collects images according to date. Its handly tools also make it easy to remove red-eye, crop, and adjust the color levels in your photographs and the software also supports uploading your pictures to plenty of online services, including Facebook, Flickr and Picasa.
You can download this app from www.yorba.org/shotwell.
22. TOR – Anonymity network – This is a free app and its license status is BSD. The app protects you from traffic analysis, it acts like a network surveillance allowing third parties to make a detailed picture of your online habits. It encrypts your network traffic and routes it through a random set of other computers obscuring the origin and destination from prying eyes. You can download the app from www.torproject.org
23. Music Player Daemon – This is a free app and its license status is GPL. It is server-side application for playing music. It is capable and can support gapless playback and filesystem monitoring; as a server. You can download the app from www.mpd.wikia.com.
24. VLC -Media player – This is a free app and its license status is GPLv2 or later. It’s a light Media Player sporting a hassle free interface that has been designed to get out of your way so that you can get on with watching your movies or listening to the latest episode of TuxRadar. It also has built-in support for almost every format known to man (with the exception of DVDs, which require you to install libdvdcss). You can download the app from www.videolan.org/vlc.
25. Clockwork Man –Game – This is a proprietary app and is priced at $14.95. The game has great background and detailed features. You can download the app from www.theclockworkman.com/en