According to Wikipedia:
Movable Type is a weblog publishing system developed by the company Six Apart. It was publicly announced on 3 September 2001, and version 1.0 was publicly released on 8 October 2001. On 12 December 2007, Movable Type was relicensed as free software under the GNU General Public License.
Movable Type has several notable features, such as the ability to host multiple weblogs and standalone content pages, manage files, user roles, templates, tags, categories, and trackback links.7
The application supports static page generation (in which files for each page are updated whenever the content of the site is changed), dynamic page generation (in which pages are composited from the underlying data as the browser requests them), or a combination of the two techniques. Movable Type optionally supports LDAP for user and group management and automatic blog provisioning.
Movable Type is written in Perl, and supports storage of the weblog’s content and associated data within MySQL natively. PostgreSQL and SQLite support was available prior to version 5, and can still be used via plug-ins.8 Movable Type Enterprise also supports the Oracle database and Microsoft SQL Server.
As of 2014, Movable Type is offered in two editions under a proprietary license, Pro (for small to mid-sized businesses) and Enterprise (for large businesses, with additional features).9
Additional plugins for Movable Type can be found here.
Movable Type is developed by Six Apart, based in Tokyo, Japan.