SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Soulver - Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.
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.
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
Prometheus - An open-source systems monitoring and alerting toolkit.