Zabbix - Track, record, alert and visualize performance and availability of IT resources
AndreaMosaic - With AndreaMosaic you can create your own photographic mosaics made with your own pictures.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
WidsMob Montage - Make stunning mosaic photos or montage shape with tiles, which supports both JPEG and PNG files.
Prometheus - An open-source systems monitoring and alerting toolkit.
Mosaic Creator - Mosaic Creator is professional mosaic tool. You can create your own picture mosaic.