FanBar puts CPU/GPU/SSD temperature and fan speed directly in the menu bar, allowing you to see the health status of your Mac at a glance. It also allows you to customize temperature control curves and multiple preset settings, with one click switching.
I built FanBar because my MacBook often stayed too hot during long coding sessions and other high-load work. I wanted the fans to respond more aggressively when needed, rather than waiting for temperatures to remain high.