You may want to have a look at Cambam as it has basic CAD, produces good gcode , and is economically priced.
All the free stuff is usually lacking in some manner. You may also want to consider AutoCAD Light.
I agree with what Vogavt since you can spend a lot of time trying different CAD products, but, like the CAM side,
what one likes another dislikes.
At one time there were probably 100 different CAD products being used by different industries. Over my many years I just stuck with
Microstation and AutoCAD. I find most other products cluncky and actually irritable to use, but, can also say the same about jumping from
one CAD program to a different one. So I personally don't even bother with other ones. The higher end CAD programs
are not cheap......over time I probably spent $4000 on just AutoCAD upgrades. I must say that for 2D work CAD versions from
1970 are just as good as compared to the latest ones .......must be able to draw lines, circles, arcs and all the other stuff just provides for efficiency.
So pick say 5 different ones, whatever one seems user friendly to you use it, but, make sure it can save as a version 12 dxf and is vector based.
You may also want to think about the future. IE; Will you want to do 3D work ( a different consideration)?
Have Fun,
RICH