Best Add-ons for precision modeling?

Hi. Does anyone have any recommendations for add-ons to help with precision modeling? I’d especially like to find something that added in the precision features sketch up has.

Thanks!

I think Construction Lines is what you want:

the developer is very active here on this forum:

1 Like

PDT (Precision Drawing Tool), Bool Tool, and a few more (I hope you have a strong computer):

Thanks. Both of these look really helpful.