Developer utilities cover the small jobs around coding: editing hosts files, inspecting binaries, testing responsive layouts, managing Xcode versions or freeing a port held by a stuck process. They are usually single-purpose apps you open for a few minutes rather than full development environments.
Many are free and open source, but maintenance varies, so check recent commit activity before relying on one. Native apps like Hex Fiend open very large files quickly, while Electron tools such as Responsively trade memory for features. Other notable picks are ImHex for reverse engineering, SwitchHosts for hosts profiles, Xcodes for installing several Xcode versions, and Finicky for routing links to specific browsers.