Man in the Middle

Modify requests, inject JavaScript and CSS into pages.

Chameleon

A platform for better user onboarding. Build, manage and improve product tours without code.

Holistic language, editor, and infra for building backends

Styles and skins for all popular sites in the web

Customize the way a web page displays or behaves, by using small bits of JavaScript.

Open-source and elegant Snackbar notifications for Android

Reader is the ultimate Reader tool for your Firefox that brings the Safari 5 Reader features to…

Greasemonkey compatible script manager.

Text.app is a simple text editor for Chrome OS and Chrome.

Violentmonkey is a userscript manager to support running userscripts in web pages.

A user styles manager for the Web