|Type of site||Public directory of Free and open source software (FOSS)|
|Owner||Black Duck Software|
|Created by||Jason Allen and Scott Collison|
|Launched||1 January 2006|
Ohloh is a website which provides a web services suite and online community platform that aims to map the landscape of open source software development. It was founded by former Microsoft managers Jason Allen and Scott Collison in 2004 and joined by the developer Robin Luckey. As of 6 July 2013[update], the site lists 590,310 projects, 538,806 source control repositories, 2,373,936 contributors and 23,457,982,058 lines of code
On 28 May 2009, Ohloh was acquired by Geeknet, owners of the popular open source development platform SourceForge. However, Geeknet sold Ohloh to the open source analysis company Black Duck Software on 5 October 2010. Black Duck plans to integrate Ohloh's functionality with their existing products to advance the site into a major resource for FOSS development.
By retrieving data from revision control repositories (such as CVS, SVN, Git, Bazaar, and Mercurial), Ohloh provides statistics about the longevity of projects, their licenses (including license conflict information) and software metrics such as source lines of code and commit statistics. The codebase history informs about the amount of activity for each project. Software stacks (list of software applications used by Ohloh's members) and tags are used to calculate the similarity between projects. Ohloh used to offer a download service.
Global statistics per language measure the popularity of specific programming languages since the early 1990s. Those global statistics across all projects in Ohloh have also been used to identify those with the most extensive continuous revision control histories.
Contributor statistics are also available, measuring open source developers' experience as observable in code committed to revision control repositories. Social network features (kudos) have been introduced to allow users to rank open source contributors. A KudoRank for each user and open source contributor on a scale of 1 to 10 is automatically extracted from all kudos in the system. The idea of measuring open source developers' skills and productivity on the basis of commit statistics or mutual rating has received mixed reactions in technology blogs.
In 2012 Ohloh launched a site for searching for source code in their database. It can search 10 billion lines of code and filter by language, project or syntax.
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