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TOP Open Source SoftwareOpen Source Accounting
An alternative to Web-based open-source accounting apps, FriFinans is a cross-platform, multi-user, client/server finance system. It tracks accounts, offers, orders, invoices, purchase orders, payments, etc. and generates pdf reports of activities. Operating System: OS Independent.
This Web-based accounting/ERP app handles purchase orders, invoices, accounts payable, inventory, sales orders, general ledger, and more. In addition, it supports multiple languages, multiple currencies, and multiple GST/VAT settings. Operating System: OS Independent
This app works well for personal finance management and also includes some small business features such as customer and vendor tracking, invoicing and bill payment, and tax and billing terms. It's not as full-featured as some other accounting programs, but it is compatible with Quicken and OFX formats. Operating System: Windows, Linux, Mac, BSD, Solaris.
osFinancials includes accounting, invoicing, stock control, and POS abilities. It supports multiple users, up to 1 million debtors and creditors, and up to 1 million stock items. Operating System: Windows.
Designed as an alternative to QuickBooks, TurboCASH is a simple but flexible small business accounting program with multi-user and multi-company capabilities. On the downside, it only runs on Windows, so you'll need an emulator if you want to run it on Linux. Operating System: Windows.
Open Source Address Book6. Rubrica
Written using GNOME and GTK+, Rubrica stores contact information as XML data. It can import/export from a variety of formats, including GnomeCard, KAddressbook, Evolution, and csv file format. Operating System: Linux/Unix.
Open Source Anti-Spam7. ASSP
Humbly claiming to be "the absolute best SPAM fighting weapon that the world has ever known," ASSP is short for "Anti-Spam SMTP Proxy" Server. While it takes a little work to get it up and running at first, it doesn't require a lot of maintenance, and the site wiki includes extensive help on configuring the app so that it works for you. Operating System: Windows, Linux, OS X.
The highly acclaimed "#1 open-source spam filter," SpamAssassin, uses a number of different features to identify spam, including header tests, body phrase tests, Bayesian filtering, blacklists and whitelists, and others. It can be used on its own, but it's also been incorporated into a number of othercommercial and open-source applications. Operating System: OS Independent.
Available as an Outlook add-on, as a Thunderbird extension, or as a stand-alone proxy, Spamato uses multiple filters to separate junk mail from the stuff you actually want to receive. Unlike some anti-spam tools, it also lets you see why a message gets classified as spam and adjust your settings as necessary. Operating System: Windows, Linux, OS X.
Open Source Anti-Spyware10. Nixory
Nixory will quickly scan your system and remove any malicious cookies from Firefox. Unlike some similar apps, you can use it alongside other anti-virus or anti-spyware applications without first disabling those systems. Operating System: Windows, Linux, OS X.
This tiny program (less than 60KB), improves security, improves performance, and closes some of the flaws which opens up Windows to spyware. It disables the Windows "calling home" features, disarms Internet Explorer, disables Windows Media Player, and more. Operating System: Windows.
Open Source Anti-Virus/Anti-Malware12. ClamAV
One of the best-known open-source security projects, ClamAV provides e-mail virus and malware scanning for Unix-based systems. Its owners update its prodigious virus database several times each day to provide up-to-the minute protection from evolving threats. Operating System: Linux, Unix.
As you might expect, this is an interface for ClamAV, this time for Linux only. The latest release adds directory whitelisting. Operating System: Linux.
Based on the well-respected ClamAV engine, ClamWin integrates with Microsoft Outlook and Windows Explorer to scan files for viruses and other malware. You can set it up to automatically download the updated virus database, and you can schedule system scans. However, unlike many commercial products, it does not include a real-time scanner for files you receive by e-mail. You'll need to save files and right-click in order to scan them for viruses. Operating System: Windows.
15. Moon Secure
This app also uses the Clam AV engine (though developers claim to be working on one of their own), but offers a different interface and some different features. Operating System: Windows.
This e-mail proxy server scans both incoming and outgoing messages for viruses, worms, trojans, spam, and other malware. Like most open-source anti-virus tools, it's based in part on the ClamAV engine. Operating System: Linux.
17. Rootkit Hunter
As you might expect from its name, Rootkit Hunter searches your system for rootkits and other unwanted tools. It does not provide live or scheduled scanning, but the Web site contains instructions for setting up your system to run Rootkit Hunter daily. Operating System: Linux, Unix.
Still getting the occasional network virus even after you install anti-virus software? Viralator supplements the existing anti-virus software on your proxy server to block malware that might otherwise slip in when users access free webmail accounts. Operating System: Linux, Unix.