Hi, Jurk, and welcome to Apple Discussions. If there are no OS X-native applications that can serve your needs, there's not much you can do, other than to use one of the OS X versions in which your antique applications work. Apple is unlikely to expend any energy to make Classic applications run better in Tiger; Classic is sort of a take-it-or-leave-it, use-it-if-you-can-and-too-bad-if-you-can't proposition now. The current Intel-based Macs don't run Classic at all, so you would be well advised to look into OS X-native applications for your purposes long before you need to replace your present Powerbook. I'm sorry not to have better news for you.