You really love your cat? Show it with Kittify and replace every image with a picture of a sweet kitty.
Replace the default theme of your admin cpanel by using V-Admin theme.
a composer plugin to replace the magento-hackathon composer installer project with a cleaner and better testable solution
A Google Chrome Extension that will replace Google Maps with other mapping services on any web site.
A collaborative effort to replace the PHP SPL extension.
Attempt to replace the C extension for SunPy's Crotate() method with equivalent Cython code.