This is an opensource database very equavalent to HanDBase. Since it is opensource it can be compiled to run on +/- any linux distribution. I have used Portabase initially on my Zaurus and then on my Netwalker. I found it very handy to have a database on a mobile device as well as my desktop PCs (home & work). Particularly if the database files are stored in a Dropbox folder for instant synchronization.
PS I am in not associated with the project in any way, I just found this a very useful program.