Can't say I know of anything that would be a drop in replacement. Have you tried running it under WINE or CrossOver Office?

I looked thru your link, and it appears to me that they are using a fairly simple MS Access Database. The "Base" Program in OpenOffice is not really up to that standard yet, but they are working on it.

There really is nothing being done there that could not be maintained in Spreadsheets. Check out this page.

You might be surprised what you can do yourself over a period of time ... even a few years. Keeping well-organized spreadsheet info around, while slowly learning how to set up a simple database (which becomes part of the kids's curriculum, if (or, as soon as) they're old enough, would be in interesting project. Feel free to leave hubby out of it, unless, of course, he insists on partaking in the fun.

The are some programs listed here that might help you.

SchoolBell and SchoolTool looks like good ones to start with.

I just wanted to post this here as lots of people come across this topic when trying to get Homeschool Tracker working on Linux.

Last October Megan & Myself finally got Homeschool Tracker on Linux with Wine.
There is a very good tutorial of how to install and get it working here: http://ubuntu4beginners.wordpress.co...tracker-linux/
It is designed for Ubuntu users but it should work on other distros just as well.