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Htop is an interactive system-monitor process-viewer written for Linux

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http://linuxlandit.blogspot.com – Irssi is an IRC client program for Linux. It was originally written by Timo Sirainen, and released under the terms of the GNU General Public License in January 1999.  Irssi was written primarily to run on Unix-like operating systems, and binaries and packages are available for Gentoo Linux, Slackware, SUSE (openSUSE), Frugalware, Fedora, FreeBSD, and Solaris. Irssi builds and runs on Microsoft Windows under Cygwin, and in 2006, an official Windows standalone build became available. Several versions are available for the UNIX-based Mac OS X, including a text-mode version using F (HowTos)