Bootstrap Hero recently launched a list of over 200 resources for Twitter Bootstrap. The article catalogs a wide range of UI widgets, from accordions and address pickers to pagination tools and a more powerful modal window. However, it also includes a range of other resources showing just how comprehensive the ecosystem is becoming.
There are tools for integrating more easily with a range of server side languages and frameworks including Microsoft ASP.net, Java, Javascript, Joomla, PHP, Perl, Python, Ruby and WordPress. There are theme generators which allow developers with limited design skills to more easily customize their sites. There are also theme marketplaces popping up (similar to ThemeForest but for Bootstrap), which allow developers to buy themes they like rather than having to do any design work on their projects.
Finally there are even a range of mockup tools like Twitter Bootstrap for OmniGraffle for designing wireframes that will be easy to implement using Twitter Bootstrap.
Twitter Boostrap was originally developed by two Twitter employees - Mark Otto and Jacob Thornton - as a “living styleguide” for Twitter’s internal web applications. It was first released as an open source project in August of 2011. A substantially revised 2.0 version was launched in January of this year with much better support for responsive design. In just sixteen months it has gone from initial public launch to being the most popular project on GitHub with over 41,000 watchers and 10,000 forks.