ServerPilot is a US-based PHP server management platform that lets you manage servers at any cloud provider, including DigitalOcean, Linode, Vultr, AWS, and Google Cloud, with automatic security updates, free SSL, and resource monitoring starting at $5/server per month.
ServerAvatar is an India-based cloud server management panel that connects to any VPS via a BYOS model, offering one-click WordPress/PHP/Node.js deployment, automated SSL and backups for developers and agencies managing multiple servers.
Froxlor is an open-source hosting control panel released in 2009 under LGPL, lightweight enough to run on a 256MB VPS, supporting Nginx/Apache, per-domain PHP management, and automatic Let's Encrypt SSL as a free server management option.