Hmmm... AIRNovel (list is by no means complete), I guess? At least I didn't hear about any attempts to reverse it and did not try it myself, but did hear about some localizers complain about it.
There are also many engines, which was partially reversed. For example, only archives and maybe sometimes images, but not scripts. For example, in case of Lucifen (list is by no means complete) archives was hacked, but there are keys from the just few games extracted, so people without knowing about reversing (there is no keyfinding tool or instruction) can't find a key (from other games). There was some script tool (some Chinese string editor), but for only one type (there are two types of Lucifen scripts: sob and some other) and even it doesn't work with most games.
Or, if you want really contribute to community, you may want to see Shiina Rio (very popular engine indeed). There are some tools, but they works only with some specific games. As I know, there are no good methods to localize quite good ranges of games on it. But do note, this engine won't succumb so easily.
Oh, and yes, if you want try something rare, which can be beneficial just for about one game, you may want to see engine of this game.
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Verily, there are many-many engines like these...