For 2nd grade, Timez Attack. It is a free download. I know they don't teach multiplication until 3rd, however, the students love it so much, they want to play. I have seen an improvement in math for the students who use it. At the end of the year, I even have 1st graders doing Timez Attack. Any of them can learn their 2's.
For keyboarding I use Dance Mat Typing. I bring up the section I want and save it so they can still access it when the Internet goes down.
I've created a bingo game I like to use when the internet is down or the computer lab is being used for NWEA testing. It highlights computer parts, software and common web page components. Here is the link