Name of the software ? KVIrc
Project/product Homepage http://www.kvirc.net / https://github.com/kvirc/KVIrc
Why we should include this into the repository, i.e. what does it do that the alternatives do not? this IRC software has a plenty of features that is unique to it...such as Encryption end-to-end for queries and even channels...DCC chat over SSL and here is a list of features : http://www.kvirc.net/?id=features&lang=en
Is it open source? yes it's open source
here is the link https://github.com/kvirc/KVIrc/archive/5.0.0-alpha1.zip / https://github.com/kvirc/KVIrc/archive/4.2.0.zip
all tho they recommend using the nightly builds the latest stable announced is 4.2.0 which is really old
they provide the nightly builds over git directly https://github.com/kvirc/KVIrc.git
Thank you