TEI Publisher allows you to publish XML without becoming a programmer and without pushing you into a one-size-fits-all framework. It is all about standards and sustainability so scholars can sleep well knowing their edition is future-proof while experienced developers will benefit by writing less code, avoiding redundancy, improve maintenance and interoperability - to just name a few.
eXist-db is a high-performance open source NoSQL document database and feature-complete application platform. It natively supports XML and is built around XML technologies across all layers which makes mapping technologies superfluous and increases productivity. From scholarly material in TEI to DocBook, JATS or large volumes of any XML data, it is the platform to best support your project.