There is now a new DBpedia Lookup application available here: https://github.com/dbpedia/lookup-application which is supposed to replace the old Lookup service (https://github.com/dbpedia/lookup) once it is fully tested. This thread can be used to discuss problems and other issues concerning the usage and functionality of the new Lookup application.
You can built the index yoursef or download it from the Databus here: https://databus.dbpedia.org/jan/dbpedia-lookup/index/
Any feedback is highly appreciated!
Here is a link to a running instance of the DBpedia Lookup with the downloaded index and the default configuration in the repository: