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Open Source lookup (aka oslookup.org) is an human edited web directory dedicated to open source community. A huge catalog of open-source software, scripts, development tools and resources

Bitcoin is a peer-to-peer currency. Peer-to-peer means that no central authority issues new money or tracks transactions. These tasks are managed collectively by the network.

ImageShack is a great, intuitive and easy-to-use media hosting service. You can upload images, flash files and movies for sharing and it also allows direct links. Registration is free and you can upload as many files as you want. Finally ImageShack provides some useful extras, like toolbars, sidebar, iphone app, uploader tool, etc. And to make your own implementations, there's a development API too.

ThinkUp captures your posts, replies, retweets, friends, followers, and links on social networks like Twitter and Facebook. We'll be adding more networks in the future. ThinkUp stores your social data in a database you control, and makes it easy to search, sort, filter, export, and visualize in useful ways.

Document Cloud is a platform that is primarily meant to be used by journalists who are reporting on (or publishing) primary source documents. They will be able to have their documents run through OpenCalais, and get comprehensive information on all the places, people and organizations that are mentioned in the document. Plus, Document Cloud can look at all the dates that are mentioned on the original text, have them plotted on a timeline, and let them know about documents that are related to what they have written. 

This service allows you convert a Flash Video / FLV file (YouTube's videos,etc) to MPEG4 (AVI/MOV/MP4/MP3/3GP) file online. It is using a compressed domain transcoder technology (outline in Japanese). It converts FLV to MPEG4 faster and less lossy than a typical transcoder. When you submit an url, it will download and convert to the video format. Then you can download the converted file. FLV to MPEG4 Conveter engine is now OpenSource. You can download the source code via subversion: http://sourceforge.net/svn/?group_id=183657

Use Nitter to browse Twitter while retaining your privacy. It's a free and open source alternative Twitter front-end focused on privacy. It's basically impossible to use Twitter without JavaScript enabled. If you try, you're redirected to the legacy mobile version which is awful both functionally and aesthetically. For privacy-minded folks, preventing JavaScript analytics and potential IP-based tracking is important, but apart from using the legacy mobile version and a VPN, it's impossible. Using an instance of Nitter (hosted on a VPS for example), you can browse Twitter without JavaScript while retaining your privacy. In addition to respecting your privacy, Nitter is on average around 15 times lighter than Twitter, and in some cases serves pages faster.