share the tools you use/know to study or work.

focus booster (timer watch)
kanbanflow (online manager with built in timer http://lifehacker.com/5905301/kanbanflow...socialflow)
rainlendar (calendar)

A tool to mark and export words - called Wired-Marker http://www.wired-marker.org/
For quick notes and anything and everything Evernote http://www.evernote.com/
I wish it was more stable, else I would use Lunarscape as my main "tool" for browsing the web, for it has many great built-in functions http://www.lunascape.tv/Products/tabid/111/Default.aspx and it is available in Japanese.

Other than that I don't use anything particularly useful worth posting here.