If you have an HP 200 LX like me and you're a fan of the old Lotus Agenda - essentially a first desktop freeform database with a strong focus on automatic data organization - you can download the linked file. It's a pre-installed version of Lotus - Agenda has apparently been freely available for quite some time. Really innovative software for its time. Although not blazingly fast on the small machine, it's definitely usable - however, not from the graphical environment of the HP 200 LX, but directly from the prompt.
Important note: Agenda is not Year 2000 compliant. The date jumps back to 1985 when you enter Agenda. So don't be alarmed, that's normal - just correct the date afterwards. However, for using Agenda as an activity planner and project manager, that's a bit annoying, since you rarely plan projects in 1985 anymore.