WebToppings is a proxy service that can add extra features to any website. It does not require installation and is completely free!

Test whether any website can be embedded in an iframe. Simple visual tool to check iframe compatibility.

AnnotateWeb is an open-source tool for real-time, collaborative website annotation. No extension or sign-up is needed for end-users. Collaborate with anyone, share your annotations as a unique URL, or export your work as a PNG. It's 100% free.

Anonymous Links by Webfuse is a Chrome extension that makes private browsing simpler. Right-click any link and select “Open in Anonymous Webfuse Session” to surf it anonymously via Webfuse’s secure platform.