Cachet is a beautiful and powerful open source status page system. It helps to list your services components, Log incidents, JSON API, Subscriber notifications via Email, Two factor authentication and lot more.

Cachet - An open source status page system, for everyone

This is effectively the missing connector between speaking to a JVM via JMX on one end and whatever logging / monitoring / graphing package that you can dream up on the other end.
 
jmxtrans is very powerful tool which uses easily generated JSON (or YAML) based configuration files and then outputs the data in whatever format you desire. It does this with a very efficient engine design that will scale to communicating with thousands of machines from a single jmxtrans instance. The core engine is very solid and there are writers for Graphite, StatsD, Ganglia, cacti/rrdtool, OpenTSDB, text files, and stdout.

This is effectively the missing connector between speaking to a JVM via JMX on one end and whatever logging / monitoring / graphing package that you can dream up on the other end.

jmxtrans - JMX metrics exporter

Telegraf is an agent written in Go for collecting, processing, aggregating, and writing metrics. Telegraf is plugin-driven, Input Plugins collect metrics from the system, services, or 3rd party APIs, Processor Plugins transform, decorate, and/or filter metrics, Aggregator Plugins create aggregate metrics (e.g. mean, min, max, quantiles, etc.) and Output Plugins write metrics to various destinations.

Telegraf - The plugin-driven server agent for collecting & reporting metrics

InfluxDB is an open source time series platform. This includes APIs for storing and querying data, processing it in the background for ETL or monitoring and alerting purposes, user dashboards, and visualizing and exploring the data and more. The master branch on this repo now represents the latest InfluxDB, which now includes functionality for Kapacitor (background processing) and Chronograf (the UI) all in a single binary.  It is designed to handle high write and query loads and provides a SQL-like query language called InfluxQL for interacting with data.

InfluxDB - Scalable datastore for metrics, events, and real-time analytics

Cabot is a free, open-source, self-hosted infrastructure monitoring platform that provides some of the best features of PagerDuty, Server Density, Pingdom and Nagios without their cost and complexity. 
 
It provides a web interface that allows you to monitor services (e.g. "Stage Redis server", "Production ElasticSearch cluster") and send telephone, sms or hipchat/email alerts to your on-duty team if those services start misbehaving or go down - all without writing a line of code. Best of all, you can use data that you're already pushing to Graphite/statsd to generate alerts, rather than implementing and maintaining a whole new system of data collectors.

Cabot is a free, open-source, self-hosted infrastructure monitoring platform that provides some of the best features of PagerDuty, Server Density, Pingdom and Nagios without their cost and complexity. 

Cabot - Self-hosted, easily-deployable monitoring and alerts service - like a lightweight PagerDuty

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

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

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

411 is an Alert Management Web Application. It configure searches to periodically run against a variety of data sources. You can define a custom pipeline of Filters to manipulate any generated Alerts and forward them to multiple Targets.

411 - An Alert Management Web Application

Chaos Genius is an open source ML powered analytics engine for outlier detection and root cause analysis. Chaos Genius can be used to monitor and analyse high dimensionality business, data and system metrics at scale. Using Chaos Genius, users can segment large datasets by key performance metrics (e.g. Daily Active Users, Cloud Costs, Failure Rates) and important dimensions (e.g., countryID, DeviceID, ProductID, DayofWeek) across which they want to monitor and analyse the key metrics.

Chaos Genius - ML powered analytics engine for outlier detection and root cause analysis

Bosun is a time series alerting framework developed by Stack Exchange. Scollector is a metric collection agent. It has an expressive domain specific language for evaluating alerts and creating detailed notifications. It also lets you test your alerts against history for a faster development experience.

Bosun - Time Series Alerting Framework

Ward is a simple and and minimalistic server monitoring tool. Ward supports adaptive design system. Also it supports dark theme. It shows only principal information and can be used, if you want to see nice looking dashboard instead looking on bunch of numbers and graphs. Ward works nice on all popular operating systems, because it uses OSHI.

Ward -  Simple and minimalistic server dashboard

 Jaggr is a command line tool to aggregate in real time a series of JSON logs. The main goal of this tool is to prepare data for plotting with jplot. 

jaggr - JSON Aggregation CLI

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