GoboLinux: In GoboLinux you can fetch and compile htop by typing: Compile htop
You can also download the GoboLinux binary package.
Debian: In Debian you can fetch htop by typing: apt-get install htop
You can also download the binary packages from the Debian webpage.
Thanks to Bartosz Fenski.
Fedora: htop is part of Fedora Extras; you can fetch it by typing: yum install htop
Thanks to Dawid Gajownik.
RedHat: You can find RPM's for htop at DAG and FreshRPMs.
Thanks to Dag Wieers.
Slackware: You can find packages for htop at LinuxPackages.
Thanks to Fred Broders, and Kanedaaa for the link.
Gentoo: In Gentoo Linux you can emerge the sys-process/htop package by typing: emerge sys-process/htop
Thanks to Wolfram Schlich.
AltLinux: here are the latest distribution and development RPM's for AltLinux.
Thanks to Ilya Evseev.
OpenSuSE: htop is included in the OpenSuSE build service. The OpenSUSE build service repository provides htop packages for Fedora 5, SUSE Linux Enterprise 10, openSUSE Factory, SUSE Linux 10.0 and SUSE Linux 10.1.
Thanks to Timo Hoenig.
Mandriva: you can find RPMs for Mandriva (formerly Mandrake and Conectiva) and other RPM-based distributions at RpmFind.
KateOS: packages are available at the KateOS Pkgportal. You may enable community repositories in /etc/updateservers or using KatePKG.
Thanks to Piotr Pelzowski.