As an open source developer for more than 20 years, I agree--using proprietary software that "locks up" your work leaves you somewhat of a hostage to that app.

That's why all of PhotoStructure's metadata changes are stored using EXIF or XMP standards either within the file, or alongside in a sidecar (if you prefer). File organization is also completely customizable, and designed to work in concert with other DAMs, if desired. Details are here: https://photostructure.com/faq/system-of-record/

Also: if the business ends, the code becomes open source. Details here: https://photostructure.com/faq/why-photostructure/#if-photos...