- GMimeStream — Abstract stream class
- GMimeStreamFile — A Standard-C FILE-based stream
- GMimeStreamFs — A low-level FileSystem stream
- GMimeStreamGIO — A wrapper for GLib's GIO streams
- GMimeStreamMem — A memory-backed stream
- GMimeStreamMmap — A memory-mapped file stream
- GMimeStreamNull — A null stream
- GMimeStreamFilter — A filtering stream
- GMimeStreamBuffer — A buffered stream
- GMimeStreamPipe — A low-level pipe stream
- GMimeStreamCat — A concatenated stream