LastPass: Free Password ManagerPassword manager
Tabs saverSaves tabs to files and can be accessed from chrome also
Print Friendly & PDFPrints / Outputs a webpage content to pdf file.
NotepadNotepad to write instant notes
The Great SuspenderExtension that suspends tabs and saves a lot of memory for not active tabsNot active anymore
Screencastify – Screen Video RecorderScreen with Webcam recorder
Email Tracking for Gmail – MailtrackTrack who opened your emails of gmail
The Marvellous SuspenderSuspend tabs that are not active

Chrono Download Manager is the first (and only) full-featured download manager that’s designed exclusively for Google Chrome. All your download managements are done inside the browser, instead of a separate download managing application. Chrono is tightly integrated with Chrome by context menus, toolbar buttons and keyboard shortcuts.