15) Unrar Extract and Recover If you need to extract a lot of RAR archive files and you're not exactly sure what all the passwords are, this tool can help. It "handles password-protected, multi-part and encrypted archives with ease," and it requires no installation. Operating System: Windows, Linux.
17) ATPad This Notepad replacement includes a number of features for developers, like a tabbed interface, line numbering, word wrapping, text coloring and more. It's won a number of awards. Operating System: Windows.
18) Notepad++ Like the regular version of Notepad++, this portable version features a tabbed interface, syntax highlighting, auto-completion, macros, and more. Supported programming languages include C, C++, HTML, ASP, Java, Pascal and CSS. Operating System: Windows.
21) PokerTH Portable This classic Texas Hold 'Em style poker game lets you play against up to ten networked or computer-generated players. It offers an attractive and highly customizable interface. Operating System: Windows.
22) Battle for Wesnoth Portable This popular open source turn-based fantasy strategy game offers a range of different sagas to play or you can create one of your own. Both single- and multiple-player options are available. Operating System: Windows.
23) T^3 Portable Play Tetris in 3D! It's simple, familiar and fun. Operating System: Windows.
24) WinBoard Portable Play the standard chess game you know or one of the variants like xiangqi (Chinese chess), shogi (Japanese chess), Makruk, Losers Chess, Crazyhouse, Chess960 and Capabanca Chess. You can play on your own or connect to other players on the Internet. Operating System: Windows.
25) Get Sudoku Portable Stumped by a Sudoku puzzle? Enter the values you know into this app and it will help you keep track of the possible answers for all of the other boxes. Operating System: Windows.
27) Inkscape Portable Inkscape offers professional-quality vector graphics editing, similar to CorelDraw or Illustrator. The features are advanced, but the interface is still relatively easy to use. Operating System: Windows.