OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase.  OpenTSDB was written to address a common need: store, index and serve metrics collected from computer systems (network gear, operating
systems, applications) at a large scale, and make this data easily accessible and graphable.

OpenTSDB - A scalable, distributed Time Series Database.

Titan is a scalable graph database optimized for storing and querying graphs containing hundreds of billions of vertices and edges distributed across a multi-machine cluster. Titan is a transactional database that can support thousands of concurrent users executing complex graph traversals. It is a native Blueprints enabled graph database and as such, it supports the full TinkerPop stack of technologies.

Titan - Scalable Graph Database 

FlockDB is much simpler than other graph databases such as neo4j because it tries to solve fewer problems. It scales horizontally and is designed for on-line, low-latency, high throughput environments such as web-sites. Twitter uses FlockDB to store social graphs (who follows whom, who blocks whom) and secondary indices. As of April 2010, the Twitter FlockDB cluster stores 13+ billion edges and sustains peak traffic of 20k writes/second and 100k reads/second.

FlockDB - A distributed, fault-tolerant graph database from Twitter

Graphite is an enterprise-scale monitoring tool that runs well on cheap hardware. It is a highly scalable real-time graphing system. It stores numeric time-series data and renders graphs of this data on demand. 

Graphite - A highly scalable real-time graphing system

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

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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OpenTSDB - A scalable, distributed Time Series Database.

Titan - Scalable Graph Database

FlockDB - A distributed, fault-tolerant graph database from Twitter

Graphite - A highly scalable real-time graphing system

Prometheus - Service Monitoring System and Time Series Database

InfluxDB - Distributed Time Series Database

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OpenTSDB - A scalable, distributed Time Series Database.

Titan - Scalable Graph Database

FlockDB - A distributed, fault-tolerant graph database from Twitter

Graphite - A highly scalable real-time graphing system

Prometheus - Service Monitoring System and Time Series Database

InfluxDB - Distributed Time Series Database

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