| AlchemyPoint | Firefox extension with a client-side Proxy Server | allows manipulation of web content, scraping of data from websites, detection/parsing of microformats, etc. |
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| GOFinder | Based on Internet Explorer | Allows playing music while navigating, can boot as a shell too. | Works best with IE9 installed. |
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| Chickenfoot | Firefox extension | enables end-users and hackers to script interactions on the Web | Not supported after Firefox V3 |
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| iMacros for Firefox | Firefox, Chrome and Internet Explorer extension | allows the user to record and replay "Internet Macros" for web automation, web scraping or web testing. | |
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| Platypus | Firefox extension | interactive modification of content from the browser, and optionally save the transformations as a Greasemonkey script for future use | |
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| Stylish | Firefox extension using Cascading Style Sheets | client-side manipulation of webpage content | |
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| Bookmarklets | JavaScript | can execute arbitrary JavaScript on any page, but requires a user to click them, rather than running automatically | |
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| Firebug | Firefox extension for developers | allows arbitrary real time changes to a page's DOM | |
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| Bubbles | Site-Specific-Browser | uses JS injection of user-scripts, very much like Greasemonkey. | |
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| Jetpack | Firefox extension providing robust API | allows writing Firefox scripts (jetpacks) using JavaScript, jQuery and Firebug | |
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| Kango Framework | Cross-browser extension framework | allows creating extensions for 5 popular browsers using JavaScript only | Firefox, Chrome, Internet Explorer, Opera, Safari |
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| Greasekit | | provides userscripting for Safari (WebKit) | |
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| Greasemonkey | Firefox extension | alters the output of web content immediately after it's displayed | |
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| Proxomitron | proxy-level language | available since late 1990s, predates JavaScript active browsing and provides a similar function for all browsers using a regexp-like matching language | |
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| Proximodo | open source, client-side proxy server | inspired by- and interoperable with proxomitron -- allows page content manipulation | |
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| Privoxy | open source, client-side proxy server | allows manipulation of page content | available in many OS flavors |
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| MouseHole | Ruby-based client-side proxy server | allows manipulation of page content | |
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| Muffin | Java open-source stand alone proxy server | allows manipulation of page content (usually client-side, but sports a web interface in addition to a Swing GUI for configuration) | |
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| BFilter | open source, client-side proxy server | allows manipulation of page content | available in many OS flavors |
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| GrimeApe | JavaScript injection proxy | provides the GreaseMonkey API for running userscripts | Konqueror and Firefox are supported |
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| Lubemonkey | Firefox extension | Fork of Greasemonkey that stores persistent data in SQLite databases for efficiency. | |
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| Reflect | Sends document to remote server for tagging | Tags the names of chemicals, genes, and proteins; clicking on a tag opens summary popups. | Supported on Firefox and IE |
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| Scone | open source stand alone proxy server (client and server side) | Allows manipulation of transferred web resources. It also provides personal web crawler, user action logging, and an mysql persistence component. |
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| BetterInternet | Crowd source augmented browsing. Server Side. | Allows real time modification of web resources. No installation required. | Supports all platforms and browsers. |
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