Mostly Free Software Tools

X-Platform
Python 2.7
Eric - Python IDE
GCC - C++ Compiler
CodeBlocks - C++ IDE
CodeLite - C++ IDE
VIM - Robust Text/Code Editor
FreeFileSync - Folder Comparison & Synchronisation
Dropbox - Cloud Storage
TrueCrypt - File Encryption
7Zip - File Archiver
Firefox - Web Browser
Firefox Add-ons Extensions - AdblockPlus,AdblockPlus PopUp Blocker, Hotmail Watcher, X-Notifier Lite, Ghostery, RightToClick, Flagfox, DownThemAll!, Tab Mix Plus
TWS API
IBPy - Python Thin Layer TWS API
VLC - Media Player/Viewer
Audacity - Comprehensive Audio Editor
Oracle Virtualbox - Keep Trucking !
dupeGuru - comprehensive duplicate file finder

MS Windows Only
WinSplit Revolution - Custom Windows Arranger
Notepad++ - Useful Lighweight Text/Code Editor
IrfanView - Image Viewer with Paintbox
NinjaTrader - Flexible Charting / Order Entry Software
TSim+ - Lightweight Order Entry Frontend for IB
MS Office - not free
KingSoft Office - free real alternative to MS Office
MS Security Essentials
QTTabBar - Tabbed File Explorer
7+ TaskBar Tweaker - Rearrange Taskbar Icons incl grouped items
SearchMyFiles - Very powerful file and easy to use search including duplicate files
Diagram Designer - Draw flow charts easily
EaseUS Partition Master Free Edition
Paint.net


Linux Only
Libre Office Suite - Free with Ubuntu