What is Halite?
Halite (named after the mineral) is a C++ BitTorrent client based on the excellent libtorrent library from Rasterbar Software. The program also relies heavily on the Boost libraries.
Last version was released on 19/12/2015, as of 2017 app is still stable and working.
Comments and Reviews
Said about Halite as an alternative
Libre piece of code, uses libtorrent as main engine, very light on resources, simple yet sufficiently verbose GUI, no installation needed.