Dave Plummer, creator of the original Windows Task Manager released with Windows NT 4.0 in 1996, has built a modern cross-platform successor called TMOG (Task Manager OG). Using a 107-page specification and Anthropic's Claude Code, Plummer developed the application in roughly four hours while waiting with his son in hospital. The beta launched July 31 for macOS, with Windows and Linux versions following August 23. TMOG features 12 monitoring views including dashboard, per-process resources, startup apps, services, network connections, and benchmarks. Status meters animate at 60Hz, efficiency cores display distinct colors, and retro phosphor themes are available. Each platform runs native code — Swift and AppKit on macOS, Direct2D on Windows, Qt 6 on Linux — sharing a C++ core. A self-monitoring option shows TMOG's own resource usage.

Plummer designed TMOG to address Windows Task Manager's limitations, such as misleading CPU reporting and unexplained background process spikes. The tool displays whole-machine history alongside process activity for easier diagnosis. The free version provides live monitoring across all platforms. A $39.95 Pro tier adds Flight Recorder for record-and-replay postmortem analysis, sold via Lemon Squeezy due to App Store sandboxing restrictions. Developed in under six weeks with two collaborators, the project demonstrates how AI-assisted coding is changing software economics. The free version has no expiration and requires no account.