They do have stable r2004 dwg write support, MIT licensed, C#
Check github.com/DomCR/ACadSharp for 2004 writers
This is a GitHub Issue
repo:libredwg
owner:LibreDWG
Title : Check github.com/DomCR/ACadSharp for 2004 writers
Issue date:

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They do have stable r2004 dwg write support, MIT licensed, C#
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