41) Magic Mail Monitor Allows control of email accounts from a single application. Remove spam before ever opening your email client with this application at the server level.
42) POPFile More than a junk mail filter, POPFile is an email classifier, allowing the end user to manage their incoming mail based on user-trained classification.
43) SeaMonkey Once known as the Mozilla Suite, today SeaMonkey is the combination of Firefox browsing technology bundled with the email client known as Thunderbird.
44) FreePOPs Created so that users of various web-based email services could have access to their email without needing to rely on the browser-only email retrieval method.
45) SpamBayes Said to be superior to most other Bayesian email classification tools, SpamBayes provides support for numerous email clients, although its best used with Outlook on Windows.
46) SongBird A desktop music player similar to iTunes, but built on Mozilla Firefox technology. Includes iPod and playlist support, in addition to streaming of MP3s.
47) VideoLAN A very strong video player for viewing and even re-encoding video files on your computer. VideoLAN supports most all of the popular video codecs on all three platforms.
48) SnackAMP Perhaps the closest thing to XMMS youll ever see on the Window side of the fence, SnackAMP is a WinAMP clone that still maintains a solid user base for music playback despite its lack of current release scheduling.
49) Blueberry 3D-desktop Described as an OPENGL replacement for the Windows desktop, Blueberry provides a very unusual 3D view of your existing desktop. While it might not be incredibly practical, it provides a unique base for development of a new windowing environment.
50) 7-Zip An open source alternative to Winzip and WinRAR, 7- zip can decompress just about any file or folder.