Tampermonkey is described as 'Free browser extension and the most popular userscript manager for Blink- and WebKit-based Browsers like Chrome, Opera Next and Safari' and is a very popular userscript manager in the web browsers category. There are more than 10 alternatives to Tampermonkey for a variety of platforms, including Mac, Mozilla Firefox, Google Chrome, Windows and Linux apps. The best Tampermonkey alternative is Violentmonkey, which is both free and Open Source. Other great apps like Tampermonkey are Greasemonkey, Stay - Userscripts Extension, FireMonkey and Greasemonkey Port.
Violentmonkey provides userscript support for Chrome, Opera, Maxthon and Firefox supporting most scripts for Greasemonkey and Tampermonkey.
Similar to Tampermonkey user-experience wise.
It's open source unlike tampermonkey
Greasemonkey is a Firefox extension that allows you to customize the way webpages look and function.
Stay is a new generation browser script manager on Safari. It supports both native scripts and tampermonkey and violentmonkey scripts.
Firemonkey is a totally new combined user-Scripts and user-Style manager. While it has similar functions to other user-Script managers like GreaseMonkey/Tampermonkey/Violentmonkey, and user-CSS managers like Stylish/Stylus/xStyle, there are also differences.
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.
Lightweight, open source, and is great for deploying userscripts without any other bells and whistles
Frida is a free open-source dynamic instrumentation toolkit for developers, reverse engineers, and security researchers created and supported by NowSecure researchers.
Frida is not a userscript manager for web browsers
No need to use an extension, data syncs between devices, 0data.
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!.
Save videos on YouTube, Vimeo and other websites in a few clicks! Share any webpage's content to Twitter, Facebook the same easy way... and much more!
it does nothing that tampermonkey does
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ViolentMonkey is lightweight and faster but lacks features needed to manage hundreds of userscripts and its developer isn't willing to add any of them. If you’re a power user, stick with TamperMonkey or choose another alternative.