CritGen! for Android
Note: This is an app you install on an Android phone or tablet.
A digital enhancement to your tabletop 3.x or PF RPG game, CritGen! allows you to generate spectacular Critical Hits or equally entertaining Critical Fumbles when the situation calls for over-the-top results.
Compare to Paizo's iCrit or iFumble apps for Pathfinder--this app is two for the price of one and keeps a running log of the results so that you can easily reference multiple criticals.