I have created a handy Excel file that helps you with your off-table work. The file has a math sheet that includes many useful calculators. Such as: pot odds, implied odds, required fold equity, setting up river shove, call EV, semibluff EV, optimal river sizing, minimum defending frequency etc..
Then I have a page with some random information (some probabilities, frequencies etc..) Then there is a bankroll management planner and a study planner.
You can buy the Poker Excel here.
(You need Microsoft Excel, the file might not work with some free software like OpenOffice etc…)