Audio

Audacity – A free sound editor – May 24, 2008

Backup & Synchronization Tools

SpiderOak – An online storage service that provides free 2GB space to backup your data – February 16, 2011
Conduit – Synchronize files between your computer and various web services – September 7, 2009
Free Tools to Synchronize, Backup and Share Files – June 25, 2009

Collaboration Tools

EtherPad – An Open Source Real Time Collaboration Editor – December 31, 2009

Collection Managers

GCstar – A Free Collections Manager Software – October 24, 2011

Dictionaries

Artha – Free Offline English Dictionary and Thesaurus for Linux – August 27, 2009

Document Converters

Pandoc – A document conversion tool that converts from HTML,Text, RTF, Markdown, S5 to other formats – January 27, 2011
txt2tags – A command line tool to convert text files to different file formats like PDF, LaTeX, MoinMoin, Man Page and so on – October 21, 2009

E-Book Readers, PDF Readers, & Converters

Nitro PDF Reader – A free alternative to Adobe Acrobat Reader – January 18, 2011
FBReader – A cross platform e-book reader – January 13, 2011
Calibre – e-book converter and management software – January 10, 2011

Email

OfflineIMAP – Backup, synchronize, and read your email while offline – October 11, 2011
Access Gmail Offline – Via Google mail extension for Chrome browser – September 3, 2011
Free Zimbra Desktop – Access all your emails offline. – January 24, 2009

Graphics

imgopt – A bash script to optimize PNG and JPEG images.
Phatch – Batch process thousands of images at once. – December 15, 2009
Save for Web GIMP Plugin – November 19, 2009
pngcrush – Image optimizer for PNG graphics – September 22, 2009
Command line tool to resize images – mogrify, Imagemagick tool – August 10, 2009
Stitch pictures together using ImageMagick convert command line tool – July 26, 2009
How to install GIMP scripts in Ubuntu Linux – July 22, 2009
Optipng – A tool to optimize PNG images for the web – July 17, 2009
Keyboard Shortcuts – Adobe Photoshop CS4 – January 1, 2009

Money Related

BSE Sensex Toolbar – A Firefox Add-on to keep track of your shares – February 1, 2011
JStock – A free stock tracking software – November 6, 2010

Mind Mapping

Visual Understanding Environment (VUE) – A free, open source mind mapping tool – January 21, 2010
XMind Video Tutorial – November 19, 2008
XMind Open Source Mind Mapping Software – November 17, 2008

Network Administration Tools

Namebench – Find the fastest DNS server for your PC/Computer – December 10, 2009

Note taking

MyNotex – A simple note taking software in Linux – April 12, 2012
Microsoft OneNote for Android – February 8, 2012
TreeDBNotes – A good PIM cum note taking software for Windows – September 18, 2011
RedNotebook – An open source Diary and Journal Software – October 24, 2010
Tomboy To Zim Wiki Conversion Script – September 25, 2010
Memoranda – Personal Diary and Scheduling tool – November 09, 2009
Evernote – Free note taking software – October 16, 2009
Note taking tools – equivalent to Microsoft OneNote – August 3, 2009

Productivity Tools

Osmo – A Free Personal Information Manager For Linux – May 31, 2011
Doit.im – Free Online Task Management Tool – April 29, 2011
Chandler – A Free GTD and Collaboration Software – April 11, 2011
Thinking Rock – A free software that follows the Getting Things Done Methodology – January 31, 2011
GTD-Free – A Free Getting Things Done Software – December 12, 2010
ReminderFox – A Firefox add-on for scheduling tasks and reminders – February 24, 2010
GTG – Task management tool in GNOME – November 27, 2009

Screen Capture Tools

ZScreen – An open source screen capture tool for Windows – January 15, 2010
Shutter – Screen capture tool for Linux – September 21, 2009
Lightscreen – A free screenshot capture tool in Windows – September 11, 2009
Screencast software – Web based solutions – September 3, 2009
import – A imagemagick tool to capture screenshots in Linux. Explained in conjunction with chvt command – July 22, 2009
Talon – Take a screenshot of web pages – Aviary Firefox extension – July 15, 2009
Xvidcap – A software which allows you to create videos of your Linux desktop and applications – July 13, 2009
Firefox Extensions – For taking screen shots of web pages – February 24, 2009
Scrot -  A command line screen capture tool in Linux – October 25, 2008

Security

Enigmail – Digitally Sign And Encrypt Your Email In Thunderbird – September 25, 2011
bcrypt – A very secure cross-platform file encryption tool – July 22, 2011
LastPass – A Free, secure, online password manager – October 26, 2010
TrueCrypt -  Free encryption software for Windows, Linux, and Mac OS X – February 3, 2010

Storyboarding

Celtx – Free storyboarding, scripting and sequencing pre-production software – July 31, 2009

Text Editors

Q10 – Free writing software (text editor) for distraction free writing – May 24, 2011
Zen Coding – A text editor plugin to help write HTML code speedily – May 04, 2010
5 Free LaTeX Editors – For Windows – March 3, 2010
Scribes – A sleek, lightweight text editor for Linux – December 25, 2008
Text editors for distraction free writing – June 12, 2008

Utilities

Redshift – A software to reduce computer eye strain – December 13, 2011
Easystroke – How to control computer programs with hand drawn mouse gestures – November 23, 2011
Linux readers – Access Linux files from Windows – May 31, 2010
wkhtmltopdf – Convert an html webpage to pdf – August 27, 2009
PosteRazor – Print huge posters using your desktop printer – July 7, 2009
Tools to type text in native languages – April 7, 2009
UNetbootin – A utility used to install Linux on a USB stick. – March 5, 2009.
WinDirStat – Disk Usage Statistics Viewer for Microsoft Windows – February 22, 2009
Windows 7 Gadgets – February 6, 2009
SpeedCrunch – An easy to use scientific calculator for Linux – December 18, 2008

Video & Movies

Totem player – Display subtitles for movies – August 23, 2009
Subdownloader – Download Movie Subtitles from Opensubtitles.org – August 21, 2009
Subtitle Editor – Create subtitles for your videos and movies – August 5, 2009

Virtualization

Convert a USB Flash IMG File to VDI for use in VirtualBox – December 3, 2009
Adding VirtualBox Guest Additions – February 12, 2009
Create a new Virtual Machine in VirtualBox – February 12, 2009

Webmaster Tools

Open source web analytics software – December 7, 2009

Web Servers

USBWebServer – A portable WAMP stack – May 14, 2011
How To Enable mod_rewrite in Apache server – December 23, 2009
Install LAMP server – December 9, 2009
A list of open source web servers – June 1, 2008

Others

Microsoft Office Web App – Now free for all – February 9, 2011
Portable Apps – USB Software for Windows – October 19, 2009
Bhuvan – India’s own Google Earth, works from within a web browser – September 15, 2009
Free alternatives to Microsoft Office Suite – July 1, 2009
List of very useful free Windows software – June 22, 2009