Man pages matching name x2go::server::agent::nx in section 3pm:

X2Go::Server::Agent::NX.3pm.en	debian 10 / libx2go-server-perl
X2Go::Server::Agent::NX.3pm.en	debian 11 / libx2go-server-perl
X2Go::Server::Agent::NX.3pm.en	debian 12 / libx2go-server-perl