LinOTP is Linux-based software to manage authentication devices for two-factor authentication with one time passwords. It is implemented as a web service based on the python framework Pylons. Thus it requires a web server to run in. LinOTP is mainly developed by the German company KeyIdentity GmbH. Its core components are licensed under the Affero General Public License. It is an open source authentication server certifiedby the OATH initiative for open authentication for its 2.4 version.