Have you looked at www.opendesign.com ?
I have not used or looked much into this but it might be an affordable option, I'd say the pro version would be your best bet. I imagine it would be similar to ODA in that you get a basic database API and a view widget (graphics engine) and building the rest of the UI, tools etc is your work.
https://www.woutware.com/
https://www.woutware.com/net/cad
https://www.woutware.com/net/cad/pricing
Thanks for the answers guys.
I was very happy to know these possibilities.
These are much more accessible tools from a financial point of view, but as was said by MickD, I will have all the work of developing the user interface. I'm not sure what I'm going to talk about now, but I believe I should consider UI, even graphical manipulation including object selection and the use of handles.
(If possible, as I don't know how the selections are exposed by the API)Once again I must make it clear that I am not sure what I am saying, but from what little I saw, the viewers do not support object selection, use of grips or something like that.
This would make the user experience quite different from what we are used to. My initial intention is to develop an application that does not force CAD users to learn a new way of working.
This makes me reflect on the question asked by BIGAL.
Why not just sit on top of Autocad, intellicad or my choice Bricscad.
In advance, I would like to thank everyone who somehow devoted their time in responding to this topic.
If you have more considerations on the subject, it would be very welcome.
Even if I said something silly above, consider it a lack of experience. My intention, in addition to learning from you, is also to keep the community alive and active.
I am very grateful for everything I learned in the Swamp.