Seconded Draftsight. The free version is AutoCAD in all but name. However I have just seen this:
IMPORTANT:
DraftSight 2019 for Windows® is offered in paid versions only.
Once you download and install DraftSight 2019 (free 30-day trial or purchased version), you will no longer be able to redownload or access any previous free version of DraftSight (2018 or earlier).
All free versions of DraftSight (2018 or earlier) will cease to run after 12/31/2019.
The paid for version is £79 a year.