1. Magento Performance TweaksThis Magento extension is based on the slides of Ivan Chepurnyi, available at http://de.slideshare.net/ivanchepurnyi/magento-performance.
6. Firegento PdfGenerates nicer and configurable PDF for invoices, creditmemos and shippings in Magento
13. phpcsOfficial FireGento Coding Standard for all FireGento modules.