gcc (outdated) :
Latest stable version: 9.1 (info); May 3, 2019 (1 month and 20 days)

lua (outdated) :
https://www.lua.org/versions.html#5.3

opencv (outdated) :
4.0 is available

qtcurve (outdated) :
https://github.com/KDE/qtcurve/releases

sshfs (outdated) :
3.5.1 available https://github.com/libfuse/sshfs/releases