TimescaleDB is an open-source database designed to make SQL scalable for time-series data. It is engineered up from PostgreSQL, providing automatic partitioning across time and space (partitioning key), as well as full SQL support. TimescaleDB is packaged as a PostgreSQL extension and released under the Apache 2 open-source license. 
 
TimescaleDB automatically scales and spreads data written to a hypertable into many dynamically-created chunks. Hypertables present the abstraction of a single table, yet transparently partitioned by time and space, they enable high insert rates even at billions of rows.

 TimescaleDB is an open-source database designed to make SQL scalable for time-series data. It is engineered up from PostgreSQL, providing automatic partitioning across time and space (partitioning key), as well as full SQL support. TimescaleDB is packaged as a PostgreSQL extension and released under the Apache 2 open-source license. 

Timescaledb - An open-source time-series database optimized for fast ingest and complex queries

Metabase is the easy, open source way for everyone in your company to ask questions and learn from data. Get a real-time glimpse into what your company is learning about your data. Activity helps people in your company find an answer, jump start their own exploration, or improve existing questions. 

Metabase - The simplest, fastest way to get business intelligence and analytics  to everyone in your company

QuestDB is a high-performance, open-source SQL database for applications in financial services, IoT, machine learning, DevOps and observability. It includes endpoints for PostgreSQL wire protocol, high-throughput schema-agnostic ingestion using InfluxDB Line Protocol, and a REST API for queries, bulk imports, and exports.
 
QuestDB implements ANSI SQL with native extensions for time-oriented language features. These extensions make it simple to correlate data from multiple sources using relational and time series joins. QuestDB achieves high performance from a column-oriented storage model, massively-parallelized vector execution, SIMD instructions, and various low-latency techniques. The entire codebase was built from the ground up in Java and C++, with no dependencies, and is 100% free from garbage collection.

QuestDB is a high-performance, open-source SQL database for applications in financial services, IoT, machine learning, DevOps and observability. It includes endpoints for PostgreSQL wire protocol, high-throughput schema-agnostic ingestion using InfluxDB Line Protocol, and a REST API for queries, bulk imports, and exports.

QuestDB - Fast relational time-series database

Plausible Analytics is a simple, lightweight (< 1 KB), open-source and privacy-friendly alternative to Google Analytics. It doesn’t use cookies and is fully compliant with GDPR, CCPA and PECR. You can self-host Plausible or have us run it for you in the Cloud. It is easy to understand and it cuts through the noise. Check your site traffic and get all the essential insights on one page in one minute. There are no layers of menus, there is no need for you to build custom reports, custom dashboards or PowerPoint documents. 
 
All the site measurement is carried out absolutely anonymously. Cookies are not used and no personal data is collected. There are no persistent identifiers. No cross-site or cross-device tracking either. Your site data is not used for any other purposes. Segment your audience by any metric you click on. Answer the important questions about your visitors, content and referral sources. Analyze paid campaigns and dark traffic using UTM parameters. Track outbound link clicks and 404 error pages. Create custom events, see how they convert and identify trends that matter.

Plausible Analytics is a simple, lightweight (< 1 KB), open-source and privacy-friendly alternative to Google Analytics. It doesn’t use cookies and is fully compliant with GDPR, CCPA and PECR. You can self-host Plausible or have us run it for you in the Cloud. It is easy to understand and it cuts through the noise. Check your site traffic and get all the essential insights on one page in one minute. There are no layers of menus, there is no need for you to build custom reports, custom dashboards or PowerPoint documents.

Plausible Analytics - Simple, open-source, lightweight (< 1 KB) and privacy-friendly web analytics alternative to Google Analytics

PostHog provides open-source product analytics, built for developers. Automate the collection of every event on your website or app, with no need to send data to 3rd parties. It provides event-based analytics at a user level, capture your product's usage data to see which users are doing what in your application. It automatically capture clicks and pageviews to analyze what your users are doing without pushing events manually. PostHog supports session recording to watch videos of your user behavior, with fine-grained privacy controls. It also has plugins to integrate your product usage data with other systems, like your CRM, or data lakes.
Its features include:
<ul>
<li>Event based analytics</li>
<li>User and Group Tracking</li>
<li>Data Visualization</li>
<li>Session Recording</li>
<li>Feature Flag</li>
<li>Heatmap</li>
<li>Correlation analysis</li>
</ul>
If you want to test or play with PostHog, try installing in Linux using Docker
<pre class="language-bash"><code> /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/posthog/posthog/HEAD/bin/deploy-hobby)" </code></pre>
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PostHog provides open-source product analytics, built for developers. Automate the collection of every event on your website or app, with no need to send data to 3rd parties. It provides event-based analytics at a user level, capture your product's usage data to see which users are doing what in your application. It automatically capture clicks and pageviews to analyze what your users are doing without pushing events manually.

PostHog - Product analytics, built for developers

Coolify is an open-source, hassle-free, self-hostable
Heroku & Netlify alternative. You can deploy Static Sites, any Node.js based applications, PHP, Rust applications hassle-free with automatic reverse proxy and SSL certs. You can create your own instance of MongoDB, MySQL, PostgreSQL, CouchDB, RedisDB,  WordPress, Plausible Analytics, NocoDB, MinIO or VSCode Server. 

Coolify - An open-source, hassle-free, self-hostable Heroku & Netlify alternative

Cube.js is an open-source analytical API platform. It is primarily used to build internal business intelligence tools or add customer-facing analytics to existing applications. Cube.js was designed to work with serverless data warehouses and query engines like Google BigQuery and AWS Athena. A multi-stage querying approach makes it suitable for handling trillions of data points. Most modern RDBMS work with Cube.js as well and can be further tuned for performance.

Cube.js — Open-Source Analytical API Platform

MLCraft is an open-source low-code business intelligence tool and a data science workflow. MLCraft was designed to query the data from several data warehouses and run machine learning experiments. Cube.js is used as a primary query layer and makes it suitable for handling trillions of data points. It is a full-stack data science platform that provides everything you need to build, manage and automate machine learning 

MLCraft - Low-code business intelligence tool and a data science workflow

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Timescaledb - An open-source time-series database optimized for fast ingest and complex queries

Metabase - The simplest, fastest way to get business intelligence and analytics to everyone in your company