otgTeX (on-the-go TeX) is an open-source port of TeX Live to the BlackBerry PlayBook. It allows the compilation of LaTeX documents locally without connecting to any external servers. This means you can alter all your TeX documents on the move!
The source code is available on Github and can be built from source for free. A pre-built application can be downloaded from the BlackBerry App World for a modest price. The App World application comes with a basic TeX distribution to keep the package size small, but more complete distributions can be downloaded and installed for free from Github. This can be done easily from within the app.