Some time ago I made Youfle[1]. I was trying to make a Trello clone, but for structured data, like a direct interface to a document database that could be used (and/or extended) by not-so-simple but yet data management contexts. The idea was to make something versatile like a spreadsheet and yet powerful as a database. The design resembles Trello (and, differently from Libreboard, it has card drag-and-drop and horizontal scrolling with click-and-drag capabilities). It works offline and saves data to PouchDB (IndexedDB on your browser, probably).<p>Documents should be written in YAML, but they also accept free text. The custom indexing, map and reduce functions, pagination, querying and other UI features were not implemented yet. To edit a card, double-click on its title. Adding the ID of other card as a value to any property of a card you create a link between the two, which you can see if you click on the body of the card after you stop editing.<p>If anyone has feedback to share about this, please let me know. The code is at GitHub[2].<p>[1]: <a href="http://fiatjaf.alhur.es/youfle/" rel="nofollow">http://fiatjaf.alhur.es/youfle/</a>
[2]: <a href="https://github.com/fiatjaf/youfle" rel="nofollow">https://github.com/fiatjaf/youfle</a>