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