Plesk is a commercial web hosting automation program. Originally released under the U.S. company Plesk Inc. and designed in Novosibirsk, Russia, Plesk was acquired by SWSoft in July 2003. SWSoft renamed themselves under the Parallels name (a brand which had been acquired by SWSoft) in 2008. In 2015 Parallels rebranded the service provider business unit to Odin.
Plesk allows a server administrator to set up new websites, reseller accounts, e-mail accounts, and DNS entries through a web-based interface. The administrator can create client and site templates, which predetermine resource-allocation parameters for the domains and/or clients.
The latest version of Plesk for Linux/Unix supports multiple POSIX platforms, including Debian, Ubuntu, CentOS, Red Hat Linux and CloudLinux. Previous versions also supported openSUSE, Fedora and FreeBSD. Plesk for Windows supports Windows Server 2008 and Windows Server 2012 operating systems.
Plesk installs custom versions of or manages versions of MySQL and PostgreSQL databases (Microsoft SQL Server and Microsoft SQL Server Desktop Engine under Windows), Apache Tomcat Java platform server, and ColdFusion server.