1. MinifyCSS & JavaScript minifier, in PHP. Removes whitespace, strips comments, combines files (incl. @import statements and small assets in CSS files), and optimizes/shortens a few common programming patterns.
4. ScrapbookPHP cache library, with adapters for e.g. Memcached, Redis, Couchbase, APC(u), SQL and additional capabilities (e.g. transactions, stampede protection) built on top.