drawing documents. It uses only opensource technologies with business-friendly
licenses. Since there is no free suitable collaborative libraries on the net,
we have implemented our own approach, so documents are synchronized between
users without delay or heavy traffic. Compared to other online editors, we use
DOCX format for inner representation of the document. This allows to avoid
implementing from/to DOCX convertors and even edit documents without server.
Server is implemented in nodejs and also supports conversion to PDF.