SpamAssassin 3.1.5 released  

SpamAssassin is a mature, widely-deployed open source project that serves as a mail filter to identify Spam. SpamAssassin uses a variety of mechanisms including header and text analysis, Bayesian filtering, DNS blocklists, and collaborative filtering databases. SpamAssassin runs on a server, and filters spam before it reaches your mailbox 

3.1.5 includes a large number of bug fixes and documentation updates.

Downloads are available from:
  http://spamassassin.apache.org/downloads.cgi?update=200608300000

Spybot for Pocket PC  

While viruses for Symbian and Windows Mobile currently seem more like proof-of-concept studies, the Windows Mobile platform offers malware writers who already know Windows a very similar environment. Spybot-S&D for Windows Mobile uses a lightweight version of the detection engine of Spybot-S&D for Windows to detect threats for Windows Mobile and Symbian.

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Free Rootkit Sniffer by Sophos  

Sophos’ Anti-Rootkit program, available to both customers and non-customers, warns if removing a specific rootkit will interfere or impact an infected PC’s operating system.  Microsoft recently said that statistics gleaned from users of its updated-monthly Malicious Software Removal Tool indicate that 14 percent of computers, or almost 1 in 6, harbor a rootkit. Sophos Anti-Rootkit works on Windows NT 4.0, Windows 2000, Windows XP, and Windows Server 2003; it can be downloaded from here.

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Dr. Salman’s Windows Security Toolkit  

Window Security Toolkit includes over 51 advanced security settings for Windows, helping you to make windows totally secured by Providing access restrictions on the control panel, users, passwords, dos, games, internet, memory, printers, desktop, display settings, network, system, Internet Explorer, and more.
Download Dr. Windows Security Toolkit