Flow-based programming for ETL and data harmonisation

Introduction

FME

We recently learned FME is popular within the (commercial) GIS communities. While this is not exactly open source software, there is also Data Exchange for Free and Open Source | Safe Software and Free and Open Source: The Inside Scoop on FME and FOSS | Safe Software.

Hale Studio

We learned the most popular open source alternative is GitHub - halestudio/hale: (Spatial) data harmonisation with hale studio (formerly HUMBOLDT Alignment Editor), see also Hale Studio Alternatives and Similar Software - AlternativeTo.net.

An introduction by the author is at https://www.quora.com/What-are-the-open-source-alternatives-to-Spatial-ETL-offered-by-FME-Safe-software. Their forum is available at https://discuss.wetransform.to/.

There are also other FME Alternatives and Similar Software - AlternativeTo.net.

Apache NiFi

On Write data from grafana in the data source - Grafana Community, we also just found Apache NiFi.