Prometheus is a systems and service monitoring system. It collects metrics from configured targets at given intervals, evaluates rule expressions, displays the results, and can trigger alerts if some condition is observed to be true.

Prometheus - Service Monitoring System and Time Series Database

Grafana is an open source, feature rich metrics dashboard and graph editor for Graphite, Elasticsearch, OpenTSDB, Prometheus and InfluxDB. It is most commonly used for visualizing time series data for Internet infrastructure and application analytics but many use it in other domains including industrial sensors, home automation, weather, and process control.

Grafana - The leading graph and dashboard builder for visualizing time series metrics

Cayley is an open-source graph inspired by the graph database behind Freebase and Google's Knowledge Graph. Its goal is to be a part of the developer's toolbox where Linked Data and graph-shaped data (semantic webs, social networks, etc) in general are concerned. 
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It supports built-in query editor and visualizer. It works well with multiple backend stores.



Cayley is an open-source graph inspired by the graph database behind Freebase and Google's Knowledge Graph. Its goal is to be a part of the developer's toolbox where Linked Data and graph-shaped data (semantic webs, social networks, etc) in general are concerned. 

Cayley - An open-source Graph Database 

InfluxDB is an open-source, distributed, time series database with no external dependencies. It's useful for recording metrics, events, and performing analytics. Everything in InfluxDB is a time series that you can perform standard functions on like min, max, sum, count, mean, median, percentiles, and more. Collect your data on any interval and compute rollups on the fly later.

InfluxDB - Distributed Time Series Database

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Prometheus - Service Monitoring System and Time Series Database

Grafana - The leading graph and dashboard builder for visualizing time series metrics

Cayley - An open-source Graph Database

InfluxDB - Distributed Time Series Database

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Projects

Prometheus - Service Monitoring System and Time Series Database

Grafana - The leading graph and dashboard builder for visualizing time series metrics

Cayley - An open-source Graph Database

InfluxDB - Distributed Time Series Database

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