How to: Open-source and free products, based on Elasticsearch
* [Fess](https://fess.codelibs.org/index.html) is an open source full featured Enterprise Search, with a web-crawler 
* [Yelp/elastalert](https://github.com/yelp/elastalert) is a modular flexible rules based alerting system written in Python
* [etsy/411](https://github.com/etsy/411) - an Alert Management Web Application https://demo.fouroneone.io (credentials: user/user)
* [appbaseio/mirage](https://github.com/appbaseio/mirage) is a 🔎 GUI for composing Elasticsearch queries
* [exceptionless/Exceptionless](https://github.com/exceptionless/Exceptionless) is an error (exceptions) collecting and reporting server with client bindings for a various programming languages
* [searchkit/searchkit](https://github.com/searchkit/searchkit) is a UI framework based on React to build awesome search experiences with Elasticsearch
* [appbaseio/reactivemaps](https://opensource.appbase.io/reactivemaps) is a React based UI components library for building Airbnb / Foursquare like Maps
* [appbaseio/reactivesearch](https://opensource.appbase.io/reactivesearch) is a library of beautiful React UI components for Elasticsearch
* [appbaseio/dejavu](https://github.com/appbaseio/dejavu/) The missing UI for Elasticsearch; [landing page](https://opensource.appbase.io/dejavu/)
* [Simple File Server](https://github.com/pitchpoint-solutions/sfs) is an Openstack Swift compatible distributed object store that can serve and securely store billions of large and small files using minimal resources.
* [logagent](https://www.npmjs.com/package/@sematext/logagent) a log shipper to parse and ship logs to Elasticsearch including bulk indexing, disk buffers and log format detection. 
* [ItemsAPI](https://github.com/itemsapi/itemsapi) simplified search API for web and mobile (based on Elasticsearch and Express.js)
* [Kuzzle](https://github.com/kuzzleio/kuzzle) - An open-source backend with advanced real-time features for Web, Mobile and IoT that uses ElasticSearch as a database. ([Website](https://kuzzle.io/))
* [SIAC](https://github.com/citybasebrooks/SIAC) - SIAC is an enterprise SIEM built on the ELK stack and other open-source components.
* [Sentinl](https://github.com/sirensolutions/sentinl) - Sentinl is a Kibana alerting and reporting app.
* [Praeco](https://github.com/ServerCentral/praeco/) - Elasticsearch alerting made simple
* [DataStation](https://github.com/multiprocessio/datastation) - Easily query, script, and visualize data from every database, file, and API.
* [DocKit](https://github.com/geek-fun/dockit) - GUI client for elasticsearch to query, manage and visualize your data.