APIDog is a cost-effective and feature-rich alternative to Postman Enterprise.
Nagios, Zabbix, Prometheus, Netdata, Checkmk, Munin, Grafana, OMD, Sensu Go, and LibreNMS are open-source alternatives to Uptime Kuma for monitoring systems and services.
These alternatives provide comprehensive monitoring capabilities, customizable checks, real-time performance monitoring, and powerful visualization tools.
Choosing the right alternative depends on specific use case, infrastructure scale, and customization requirements.