WordBlock: Download
WordBlock is free software (meaning you do not have to pay for using it). It is not (yet) open source. I'm still considering what the benefits woulds be there. WordBlock needs the .NET Compact Framework. If you own a PocketPC 2003 or higher, it is pre-installed. For a PocketPC 2002, you can download the framework from Microsoft. Older versions are unsupported, I'm afraid.
You can download an Installer file is ZIP format. To install on your PocketPC, run the Setup.exe while your PocketPC is connected through ActiveSync. The install can easily be undone again through ActiveSync. The software is only available in the English language, but the word lists used in the game can be a different language. I offer an English and a Dutch version for download. If you want to create a word list for your own language, check out the WordBlock: Modifying and Extending article. I would be happy to offer your translation for download as well.
Download the English version
Download the Dutch version