ogham
This is a simple program that transliterates English text to Ogham and vice versa.
Note that it only converts A-Z (case insensitive) and space, and some English letters will convert to the same character in Ogham, as a few do not have an equivalent to English ("x" for example).
This project requires make, g++ (C++11), and libzed. To compile, just run make.
Note that while this does compile and run on Windows, the default command prompt does not support UTF-8 text, so any Ogham output will be a garbled mess. If you can make it work, power to you. I honestly just can't be bothered.
To use the resulting binary, you can run it with any text as command-line arguments. They will be read as if separated by a single space.
Alternately, you can run with no arguments for an interactive prompt (ctrl-D to exit).