File Transfer

62. WinSCP

WinSCP allows users to transfer files securely via FTP and SFTP. It incorporates Secure Shell (SSH) technology. Operating system: Windows.

63. cURL

Powered by libcurl, cURL transfers files using URL syntax. It supports SSL certificates, FTP uploading, proxies, cookies, password authentication, proxy tunneling, and more. Operating system: Windows, Linux/Unix, OS X, Solaris.

64. rsync

Using the "rsync algorithm," rsync transmits only the differences between two files in order to synchronize remote files quickly. It can update whole directory trees and filesystems, and it supports anonymous rsync, which is ideal for mirroring. Operating system: Unix.

Games

65. StepMania

Very similar to Dance Dance Revolution, StepMania lets you perfect your dance moves and rhythm in the comfort of your own home. You can hook up dance pads if you have them, or you can let your fingers do the dancing on your keyboard. Operating system: Windows, Linux/Unix, OS X, Xbox.

66. ScummVM

ScummVM allows you to port many classic point-and-click adventure games to nearly any platform you like. Supported games include Simon the Sorcerer 1 and 2, Beneath A Steel Sky, Broken Sword 1 and Broken Sword 2, Flight of the Amazon Queen, Monkey Island, Day of the Tentacle, Sam and Max, and dozens of others. Operating system: OS Portable.

Instant Messaging

67. Pidgin

Pidgin lets you use all of your IM accounts at once, with all of the features of each account plus a few unique add-ins, like Buddy Pounce. It supports AIM, Google Talk, Groupwise, MSN, Yahoo, and more. Operating system: Windows, Linux/Unix.

68. aMSN

This MSN Messenger clone allows you to communicate with users on multiple networks. aMSN also allows you to display pictures and emoticons and add skins to your chat window. Operating system: Windows, Linux/Unix, OS X.

69. Miranda

Miranda is an extremely small, fast, easy-to-use IM client. It works with multiple networks including AIM, Gadu-Gadu, IAX, ICQ, IRC, Jabber, MSN, Netsend, Tlen, and Yahoo. Operating system: Windows.

Mind Mapper

70. FreeMind

This Java-based tool makes it easy to brainstorm, create outlines, and organize your thoughts. It creates multi-color free-form diagrams that fold and unfold with a single click and are easy to turn into html pages. Operating system: OS Independent.

Mobility Tools

71. PortableApps

Like its name suggests, PortableApps aims to make all of your applications portable. It makes it easy to transfer software and data from your PC to a USB flash drive, iPod, portable hard drive, or other device. Operating system: Windows.

72. floAt’s Mobile Agent (FMA)

This phonebook editing tool lets makes it easy to organize the contacts and other information stored on your mobile phone. It can also be used to make and receive phone calls from your PC. Operating system: Windows.

73. BitPim

If you have a phone based on the Qualcomm CDMA chipset, BitPim lets you view and manipulate your PhoneBook, WallPaper, Calendar, RingTones, and other data. The Web site contains a complete list of supported phones. Operating system: Windows, Linux/Unix, OS X.