MonitorFree

MonitorFree does server monitoring with an opinion: watching a dashboard is not enough. You get live CPU, memory, disk, and network metrics every 15 seconds for Linux and Windows machines, plus alerts the moment a port opens or a watched file changes. The difference shows up when something breaks at 2am, because you can restart a service, kill a runaway process, or reboot the machine straight from your phone without opening a terminal. Installing the agent is a single curl command with your token, and the free tier covers two servers with no card required. I like that the alert types include file changes, since most cheap monitors only ping ports. The trade-off for remote actions is trusting a third party with root-level reach into your boxes, so read the docs before you point it at production. A solid pick for solo developers running a handful of VPS instances.