Irccd is only distributed as source package on the official website but some distributions may provide binary packages.
Current version is 4.0.1
Current legacy version is 3.1.1
Note: this version gets only security and bug fixes and will be unsupported by the end of 2023.
For those who wants to use the development version, it is available in the Mercurial repository:
hg clone http://hg.malikania.fr/irccd
Then, regularly update using the following command:
hg pull -u