I have been using gfxCardStatus to monitor which graphics card my MacBook Pro has been using for years now. It's always worked without a hitch. I upgraded my computer to a new high end 15" rMBP and it doesn't appear to work properly. It's very glitchy. The problem more likely lies with Yosemite than the hardware, but I've had to disable it for now. gfxCardStatus doesn't appear to be developed anymore. Are there any good alternatives that do the same job? Free or paid.