Memex : Browser Extension to full-text search your browsing history & bookmarks.
Browser Calories : The easiest way to measure your performance budget.
Zephir Language : Zephir, an open source, high-level/domain specific language designed to ease the creation and maintainability of extensions for PHP with a focus on ty...
SlimerJS : A scriptable browser for Web developers
Insight.io : Insight.io brings IDE-like code intelligence features such as cross-reference, class hierarchy and semantic search, right into your browser and helps ...
Measure between the following elements: images, input-fields, buttons, videos, gifs, text, icons. You can measure everything you see in the browser.