Greasemonkey is a Firefox extension that allows you to customize the way webpages look and function.



Greasemonkey is the most popular Open Source & free alternative to Launchlet.
- Greasemonkey is Free and Open Source
- Greasemonkey is Customizable
Launchlet is described as 'Customize the web with JavaScript or CSS' and is a userscript manager in the development category. There are more than 10 alternatives to Launchlet for a variety of platforms, including Mozilla Firefox, Google Chrome, Mac, Windows and Linux apps. The best Launchlet alternative is Greasemonkey, which is both free and Open Source. Other great apps like Launchlet are Violentmonkey, Tampermonkey, Makeover - Custom CSS and Userscripts.
Greasemonkey is a Firefox extension that allows you to customize the way webpages look and function.



Greasemonkey is the most popular Open Source & free alternative to Launchlet.
Violentmonkey provides userscript support for Chrome, Opera, Maxthon and Firefox supporting most scripts for Greasemonkey and Tampermonkey.



Tampermonkey is a free browser extension and the most popular userscript manager for Blink- and WebKit-based Browsers like Chrome, Opera Next and Safari.




Tampermonkey is the most popular Windows, Android, Mac & Linux alternative to Launchlet.
Makeover lets you change the appearance and behavior of web pages with CSS and JavaScript. To use it, you go to a web page you want to customize, tap the Makeover icon, and paste the code into the text field.




Makeover - Custom CSS is the most popular iPhone & iPad alternative to Launchlet.


Powerlet is the most popular Web-based alternative to Launchlet.
Macaque is a UserScript Manager Browser Extension. Macaque provides you the ability to add, edit, remotely edit, as well as view the console logs for each UserScript!.




Macaque is the most popular commercial alternative to Launchlet.
Greasemonkey Port is a userscript manager for SeaMonkey, originally written by Aaron Boodman and currently SeaMonkey front-end maintained by Marti, Ratty and/or Farby with some backend support from Anthony Lieuallen and Johan Sundström.

Frida is a free open-source dynamic instrumentation toolkit for developers, reverse engineers, and security researchers created and supported by NowSecure researchers.


Frida is the most popular Self-Hosted alternative to Launchlet.
Full featured multi arch/os debugger. The purpose of Dwarf is to simplify tasks while doing reverse engineering, cracking and security analysis on a process running on a mobile phone running either Android or iOS.

