Some stuff I released months ago but never posted:
Luigi Template, version 0.5.0: Simple multi-language string templating library inspired by Unix pipes. Version 0.5.0 includes better documentation, faster rendering, implementations for Java, JavaScript, PHP, and Ruby.
Mathy: Web-based LaTeX math renderer.
ZipStream-PHP, version 0.3.0: PHP library that allows you to dynamically generate streamed Zip archives. Version 0.3.0 is a clean rewrite for PHP 7. It includes a test suite, Composer support, and API documentation.