I'm an architect with more than 25 years of experience in the field and 20 years of experience using 3d/cad software. After working with different programs I decided to find a way of doing my job with free/open source tools dedicating the last 10 years of my life to investigating how to replace the workflow I previously had. Today I can say I've totally replaced the use of commercial tools with great free alternatives delivering a product that matches the overall quality of traditional software.