I saw that tmsnc is being deleted from portage (http://bugs.gentoo.org/show_bug.cgi?id=240045). It is discontinued, good thing. However from the tmsnc website http://tmsnc.sourceforge.net/ I see that the project is being continued in fama-im: http://www.fama-im.org/ It would be good to have it to replace the missing tmsnc
Upstream appears to now be https://sourceforge.net/projects/fama/ but also no updates since 2013.