Antivirus

• ClamWin Portable: ClamWin Portable is the popular ClamWin antivirus packaged as a portable app, so you can take your antivirus with you to scan files on the go.
• Avast: avast! Home Edition is now free of charge for HOME users for NON-COMMERCIAL use.

Office Tools

• Zoho: Complete office suite include a word processor, spreadsheet, presentation tool, and more
• OpenOffice.org Portable: Complete OpenOffice.org office suite -- including a word processor, spreadsheet, presentation tool, drawing package and database
• Google Docs & Spreadsheets: Free web-based word processing and spreadsheet program that keeps documents current and lets the people you choose update files from their own computers.
• OpenOffice.org: Multiplatform and multilingual office suite and an open-source project
• NeoOffice: Fully-featured set of office applications (including word processing, spreadsheet, presentation, and drawing programs) for Mac OS X.

Operating System

• Damn Small Linux: DSL is a very versatile 50MB mini desktop oriented Linux distribution. Boot from a USB pen drive

RSS Software

• RssReader: RssReader is a program to read RSS and Atom news feeds. RssReader collect news in the background at user configurable intervals and warn with a little popup in the system tray that there is a new message arrived.
• Rss Bandit Team: RSS and Atom reader written with the .NET Framework. Features include the ability to view news items in customizable newspaper views, the ability to synchronize the read and unread state of the application across multiple computers, the ability to expire items so they get deleted after a certain amount of days, fine grained control of how often items are downloaded, support for password protected feeds, reduced bandwidth consumption by using HTTP conditional GETs and GZIP encoding, search folders, viewing comments directly in the reader without going to the site, posting comments from the reader, integrated Web search, tabbed browsing, and security settings for disabling unsafe browser features like ActiveX.

PDF Converter

• pdfforge.org: Site dedicated to the OpenSource projects that will help you in forging PDFs just as they are supposed to be.
• PrimoPDF: Convert to PDF from any application by simply 'printing' to the PrimoPDF® printer - it couldn't be easier! Within minutes, you can create high-quality PDFs by converting from Word, Excel, PowerPoint, and virtually any other printable file type.

Anti Spyware

• Ad-Aware SE Personal Edition: With the ability to scan your RAM, Registry, hard drives, and external storage devices for known data-mining, advertising, and tracking components, Ad-Aware SE easily can clean your system, allowing you to maintain a higher degree of privacy while you surf the Web.

The software listed above is for free distribution, please carefully read its instructions before to be installed.