Naoki Takahashi's `NScripter' is a popular Japanese game engine used
for both commercial and free visual novels. It attained popularity
due to its liberal terms of use and relative simplicity. However, it
is closed source software and only available for Windows.

A number of cross-platform clones exist, and Ogapee's `ONScripter' is
the most popular of these. Due to the ease with which it can be
modified to support languages other than Japanese, ONScripter has been
adopted by the visual novel localisation community as the engine of
choice for translated NScripter games; the patch to support English
even made it into the main ONScripter source code.

Nevertheless, the English-language community has found it convenient
to maintain its own branch of the code, and to enhance it in ways best
suited to the use we make of it.

ONScripter-EN is that branch.
