Learn Excel
»Chandoo is a site to learn Microsoft Excel and Charting online. It has excel tips, charting tutorials, visualisation ideas, downloadable tutorials. There is also an active forum where you can discuss your problems. http://chandoo.org
Sourceforge.net
»If you are looking for open source software, go to http://sourceforge.net. It is a web-based source code repository, which covers many categories such as audio & video, business & enterprise, communications, home & education, games, utilities and so on.
It is a centralised location for software developers to manage open source projects. There is also an interesting forum here to discuss open source software.
(Contributed by Avinash G)
Download Videos
»Keepvid helps you download videos from Youtube. Open www.keepvid.com and copy the URL of the Youtube video you want top download and paste it in the text box on KeepVid home page.
Click on 'Download' and you get different quality download options. Choose the quality of video you want to download and click, your video will be downloaded.
(Contributed by Ganesh Vernekar)