quickstream is an alternative to GNU Radio. quickstream is a C code API (application programming interface) DSO (dynamic shared object) library and several executable programs that link with that library, and many smaller C code objects (modules) called blocks. quickstream introduces many novel functionalities while mimicking many features from GNUradio. quickstream is not vaporware. An alpha release of quickstream has been made. It's available to download at https://github.com/lanceman2/quickstream#readme Please look at the link.

quickstream is just starting, so there are not a lot of blocks in it yet, but it can connect with a GNU radio flow graph.