BGI Tools - toolkit for ripping resources from Ethornell's Buriko General Interpreter. Used in English version of Higurashi no Naku Koro Ni
AE - VN Tools http://wks.arai-kibou.ru/ae.php?p=dl
General purpose extractor/decoder and recompressor/encoder for various archive and image formats. Supports both original Japanese Higurashi (nScripter) and English edition (BGI). Constantly updates.
Discontinued general purpose ripper. Able to extract from tons of engines, including nScripter and BGI.
Discontinued due to C&D letter from minori. General purpose ripper. Able to extract nScripter and BGI-based VNs as well.