AlternC is a set of open-source Web Hosting server management software for Linux/UNIX-like systems, whose aim is to promote self hosting by individuals or small structures, and provide its users with an easy web-based interface to manage a web and mail server (and other Internet-based services).

In 2000, the French free hosting provider Altern.org stopped its service after a complaint and a trial against Estelle Hallyday, effectively cutting down 47634 websites.

As of today, some non-profit hosting providers are using and developing that software suite: Lautre Net, the founder of that project, but also Globenet, and other structures in Belgium, Québec and Africa.

Some professional web hosting companies are also using AlternC and participate actively to the code, such as Octopuce, Neuronnexion and Webelys.

A poll from 2010 estimated that at least 110 servers were running AlternC, having a total of 3500 accounts, hosting more than 9500 domain names, and 25000 POP/IMAP email accounts, with 2200 domain names and around thousand users from l’Autre Net, (this poll was only counting people actively helping the project) This project is still actively developed.