Contao (formerly TYPOlight) is a free content management system (CMS) for medium to large websites. The program specializes in back-office (i.e. for developers) and front-office (i.e., for users) accessibility, and observes XHTML, HTML5 and CSS standards, according to W3C/WAI guidelines, to generate pages. The program is an open-source project, published in its original form in 2006 by Leo Feyer. Proven. Since 2006. Con­tin­u­ous and pre­dictable de­vel­op­ment. In­ter­na­tion­al agen­cies and com­pa­nies are suc­cess­ful­ly us­ing Con­tao. Steadfast. Current. High de­vel­op­ment stan­dards, reg­u­lar up­dates, fast and re­li­able fix­es, and 4 years of sup­port for LTS ver­sions. Easy. Intuitive. Thanks to its con­sis­tent op­er­at­ing con­cepts, and to ed­i­tors who quick­ly piv­ot to make up­dates and changes Con­tao. Versatile. Mobile. In­di­vid­u­al, search en­gine-friend­ly and bar­ri­er-free de­sign im­ple­men­ta­tion for desk­top, tablet, and smart­phone. Solid. Changeable. As an open-source CMS, Con­tao is based on open web stan­dards and is eas­i­ly adapt­able to your needs. Support? Ask! Com­pe­tent part­ners and a strong com­mu­ni­ty re­spond in the fo­rum or in pro­fes­sion­al train­ings.