SuperSakura is a visual novel engine that can run quite a few old games, mostly published by JAST. Although Season of the Sakura, Runaway City and The Three Sisters' Story are well known for their English localisations, many more titles were never localised... they will be now.

These old visual novels (both eroge and non-H) tell interesting stories. With visual improvements and a smooth user interface provided by SuperSakura, they are at best a delightful experience, at worst a curiosity of historical interest. JAST was, after all, one of the first developers in the field.

The time has not been right yet to implement a few key elements, such as saving or sound, so the engine cannot be considered fully functional, although a handful of titles should be completable.

When will SuperSakura be ready? As with any programming project, it's hard to say. I update the Progress page about every other week, if you'd like to keep up with the development.

In the meantime, you may want to check out VileVN. It is an open source visual novel engine that can run Nocturnal Illusions Renewal, Mayclub DX, as well as Divi-Dead and the JAST Memorial Pack, with upcoming support for a number of more recent games. Although I think SuperSakura is a slicker engine, theirs is already acquirable and therefore intrinsically more exciting at this time.