Project-Umbra is a project mainly written in Java, it's free.
Mhasiran text editor
PROJECT-UMBRA
Project Umbra is a text editor for the fictional language Mhasira, which text is written in a special font in vertical columns from left to right.
The editor is capable of displaying text vertically and allows the user to write simple texts with relative ease. The editor displays all correct variations of the characters, something other programs such as word is incapable of.