DuckDuckGo: Bang - Search thousands of sites directly from DuckDuckGo
History Search - History Search remembers what's on all those websites you visit so you can find them again.
Land Ho! - Incognito search where you maintain your own search history.
Microsoft Web Activities - Microsoft's new extension bringing timeline to Chrome
Chataco - The social network for an easy, fun, objective internet
Genie History Search - Always find the page you are looking for, like magic.