The following programs require .NET 3.5 SP1, which can be downloaded here. Mono (for Linux) can support 3.5, but testing in Mono hasn't been done. Any Windows OS with .Net 3.5 SP1 installed will run the following programs.
Encounter Manager version 0.7 is available here.
Character Sheet version 0.7.9 is available here.
See the changelogs for features/changes. All questions and/or comments can be addressed to email@example.com.