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I made this fooling around with draw.io, an online flowchart/org-chart maker. It's a clunky interface (LibreOffice is better), but it hooks into Google Docs & Google Drive for auto-backups. However, it's impossible to export individual elements out -- you can copy & paste in, but not copy & paste out into an ODT or Word file. Ultimately this has limited usability for me, but it was fun to play around with.