If you only need views and simple editions of drawings, you can use DWG Fastiew for PC, Mobile and Web.
DWG FastView for PC: https://en.dwgfastview.com/cloud/windows/
DWG FastView for Mobile: https://en.dwgfastview.com/cloud/mobile/
View DWG Online: https://en.dwgfastview.com/flash/touploadfile
DWG FastView probably meets most people's need and DWG FastView Pro is a professional CAD designing software for designer, architect, engineer and design studios, as well as small & medium sized businesses.