Spectacle. Istat menus. CPU and GPU Highly detailed CPU info, with current usage for individual cores, history graphs, load averages, uptime, CPU frequency, and a list of the apps using the most CPU.
Plus, GPU memory and processor usage on supported Macs, and the active GPU can be shown in the menubar. Memory Extensive memory stats covering usage, history, memory pressure, compressed memory, swap, and a list of the apps using the most memory. TermiT/Flycut: Clean and simple clipboard manager for developers.