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

Consul is a tool for service discovery and configuration. Consul is distributed, highly available, and extremely scalable. Consul makes it simple for services to register themselves and to discover other services via a DNS or HTTP interface. Register external services such as SaaS providers as well. It prevents routing requests to unhealthy hosts and enables services to easily provide circuit breakers. 
 
A flexible key/value store enables storing dynamic configuration, feature flagging, coordination, leader election and more. The simple HTTP API makes it easy to use anywhere. It is built to be datacenter aware, and can support any number of regions without complex configuration.

Consul is a tool for service discovery and configuration. Consul is distributed, highly available, and extremely scalable. Consul makes it simple for services to register themselves and to discover other services via a DNS or HTTP interface. Register external services such as SaaS providers as well. It prevents routing requests to unhealthy hosts and enables services to easily provide circuit breakers. 

Consul - Tool for Service Discovery, Monitoring and Configuration

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

GoAccess is an open source real-time web log analyzer and interactive viewer that runs in a terminal on *nix systems or through your browser. It provides fast and valuable HTTP statistics for system administrators that require a visual server report on the fly. It supports nearly all web log formats (Apache, Nginx, Amazon S3, Elastic Load Balancing, CloudFront, etc) 

GoAccess - Real-time web log analyzer and interactive viewer that runs in a terminal in *nix systems or through your browser

Dry is a terminal application to manage Docker. It shows information about Containers, Images and Networks, and, if running a Docker Swarm, it also shows all kinds of information about the state of the Swarm cluster. It can connect to both local or remote Docker daemons. Besides showing information, it can be used to manage Docker. Most of the commands that the official Docker CLI has, are available in dry with the same behaviour. 

Dry - A Docker container manager for the terminal

Thoth is a real-time solr monitor and search analysis engine. It's a set of tools that can help you collect, visualize and leverage data coming from your solr search infrastructure.

Thoth - Real-time Solr Monitor and Search Analysis Engine

Bro is a powerful network analysis framework that is much different from the typical intrusion detection system you may know. Bro provides a comprehensive platform for more general network traffic analysis as well. 
 
Bro is a passive, open-source network traffic analyzer. It is primarily a security monitor that inspects all traffic on a link in depth for signs of suspicious activity. More generally, however, Bro supports a wide range of traffic analysis tasks even outside of the security domain, including performance measurements and helping with trouble-shooting.
 
Bro comes with built-in functionality for a range of analysis and detection tasks, including extracting files from HTTP sessions, detecting malware by interfacing to external registries, reporting vulnerable versions of software seen on the network, identifying popular web applications, detecting SSH brute-forcing, validating SSL certificate chains, and much more.

Bro is a powerful network analysis framework that is much different from the typical intrusion detection system you may know. Bro provides a comprehensive platform for more general network traffic analysis as well. 

Bro - Network Security Monitor

Performance Co-Pilot (PCP) provides a framework and services to support system-level performance monitoring and management. It presents a unifying
abstraction for all of the performance data in a system, and many tools for interrogating, retrieving and processing that data. The distributed PCP
architecture makes it especially useful for those seeking centralized monitoring of distributed processing.

Performance Co-Pilot - System Performance and Analysis Framework.

LinDB is an open-source Time Series Database which provides high performance, high availability and horizontal scalability. LinDB takes a lot of best practice of TSDB and implements some optimizations based on the characteristics of time series data. Unlike writing a lot of Continuous-Query for InfluxDB, LinDB supports rollup in specific interval automatically after creating the database. Moreover, LinDB is extremely fast for parallel querying and computing of distributed time series data.
 
LinDB supports Metric + Tags + Fields, and is schema-free; The LinQL is handy for realtime data analytics. Tags based sharding strategy in LinDB solves the hotspots problem, and is truly horizontally expanded available by simply adding new broker and storage nodes.

LinDB is an open-source Time Series Database which provides high performance, high availability and horizontal scalability. LinDB takes a lot of best practice of TSDB and implements some optimizations based on the characteristics of time series data. Unlike writing a lot of Continuous-Query for InfluxDB, LinDB supports rollup in specific interval automatically after creating the database. Moreover, LinDB is extremely fast for parallel querying and computing of distributed time series data.


Lindb - Distributed Time Series Database

Kapacitor is a open source framework for processing, monitoring, and alerting on time series data. Kapacitor imports (stream or batch) time series data, and then transform, analyze, and act on the data. It uses Telegraf to collect system metrics on your local machine and store them in InfluxDB.
 
Kapacitor’s alerting system follows a publish-subscribe design pattern. Alerts are published to topics and handlers subscribe to a topic. This pub/sub model and the ability for these to call User Defined Functions make Kapacitor very flexible to act as the control plane in your environment, performing tasks like auto-scaling, stock reordering, and IoT device control.

Kapacitor is a open source framework for processing, monitoring, and alerting on time series data. Kapacitor imports (stream or batch) time series data, and then transform, analyze, and act on the data. It uses Telegraf to collect system metrics on your local machine and store them in InfluxDB.

Kapacitor - Open source framework for processing, monitoring, and alerting on time series data

A cross-platform graphical process/system monitor with a customizable interface and a multitude of features. Inspired by both gtop and gotop.

bottom - Yet another cross-platform graphical process/system monitor

kmon provides a text-based user interface for managing the Linux kernel modules and monitoring the kernel activities. By managing, it means loading, unloading, blacklisting and showing the information of a module. These updates in the kernel modules, logs about the hardware and other kernel messages can be tracked with the real-time activity monitor in kmon.

kmon - Linux Kernel Manager and Activity Monitor 

Zenoss Core is an open source IT monitoring product that delivers the functionality to effectively manage the configuration, health, performance of networks, servers and applications through a single, integrated software package. 

 It could collect data via SNMP, SSH, WMI, JMX and Syslog. Virtual and Cloud Infrastructure Monitoring and Management is possible. It manages events from various sources like syslog, SNMP trap, Windows Event log. It has secured web portal to visualize the data in the graphical charts. Reports could be scheduled and send it to Admin via EMail. 

 Sourceforge Location: <A HREF="http://sourceforge.net/projects/zenoss/" target="_blank">http://sourceforge.net/projects/zenoss/</A>

Zenoss Core is an open source IT monitoring product that delivers the functionality to effectively manage the configuration, health, performance of networks, servers and applications through a single, integrated software package.

Zenoss - Open Source IT Management

Yamon is a very simple Perl program designed to check whether a server is up-and-running and send an alert to a human when something appears to be broken. It can check for Web server, Email server, DSL line etc.

Yamon - Yet Another Monitoring script 

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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