phpSweetPDO is a PHP PDO wrapper, which is extremly simple to use, phar packaged to ease deployment, and compact (at 400 lines of commented code). It optionally supports events, which allow for easy profiling and debugging.
BovinusPHP is a PHP library which allows the definition of grammars and the creation of parsers.
Excel2JSON exports an Excel workbook into JSON, useful for Web applications powered by Excel xlsx files.
A remote API for administering Octopress instances.
Graph drawing utilities with web and graphical interfaces.