Lucidchart isn't open source but it does have a public API allowing the editor to be embedded in other applications. https://www.lucidchart.com/pages/api_docum

Lucidchart isn't open source but it does have a public API allowing the editor to be embedded in other applications. https://www.lucidchart.com/pages/api_documentation https://www.lucidchart.com/pages/api_documentation Or it has a simpler Visio API which allows other applications to use Lucidchart as a Visio viewer.