The main alternatives to EOS are Scaling Up, Pinnacle, 4DX, OKRs, the Great Game of Business, and Measured in Millions. Scaling Up, Pinnacle and the Great Game of Business are full operating systems. 4DX and OKRs are execution and goal layers designed to sit on top of an existing system. Measured in Millions is a full operating system built for long-cycle B2B companies whose revenue is concentrated in a small number of relationships.