From IFWiki

RemGlk stands for "Remote Glk" and is a Glk library implementation for IF interpreters. It is a C library that can be linked with a number of Glk-interfacing interpreters such as Glulxe, Git, Bocfel, etc. It emits JSON data in entire story frames and can almost be considered an API in front of Glk's normal character and string oriented C functions. It currently supports Glk graphic images, graphic windows, hyperlinks and timers. Sound support has been announce as under development.