Page 2 Stage : decent free, open-source app that's almost portable
I recently started writing a screenplay and, having little experience in the field, needed something to help me make it easier on myself.
Enter: Page 2 Stage. It was recently released as freeware by its former maintainers, and they even released the source code.
This seems like a prime candidate for being made totally portable:
* The registered version is free for download from the former producer and they even provide their corporate username and registration key so everyone can register for free.