SeaLion is described as 'FREE Linux server monitoring and debugging tool for easy troubleshooting across hundreds of servers. View raw output of critical events across your servers and debug your server issues. Latest version shipped with 5 default services' and is an app in the development category. There are more than 25 alternatives to SeaLion for a variety of platforms, including Web-based, Linux, Windows, Mac and Self-Hosted apps. The best SeaLion alternative is Webmin, which is both free and Open Source. Other great apps like SeaLion are Zabbix, Cockpit Project, Nagios and Datadog.