Ktechlab might be a bit more popular than ArchiCAD. We know about 1 link to it since March 2021 and only 1 link to ArchiCAD. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I use archicad - You can get a 30 day trial and after that you can still use the software in demo version which means everything is enabled but you cannot save the file (not great but its maybe worth it). https://graphisoft.com/us. Source: over 1 year ago
I found ktechlab and QUCS, both of them are Open Source. Source: about 2 years ago
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