We migrated a big relational research database to a file-based solution - requirements were:
- Super fast and easy editability for users
- Highest performance for parsing/validating >10K documents on every user change.
Our trials with YAML/TOML showed us that we wanted something both faster  and easier ,
something tailored for file-based content management ... and after months of
research & development it's now publicly available (under MIT license) for everyone!
Last but not least I also want to mention eno's document introspection capabilities -
with a few lines of code you can build intelligent relational suggestion UIs as shown in  below.
Your input for the Roadmap is highly welcome - what do you think should be in the next releases?
More languages? (If so, which? Currently in progress: Rust/PHP, Currently planned: Go/Java)
Additional IDE/editor support? (Currently supported: Atom/VSCode/Sublime)
Or something else entirely? :) Looking forward to your feedback!