Hydrological analysis with the PCRaster Tools plugin in QGIS

The Community Health Maps blog has some great tutorials by Kurt Menke.

Great free QGIS tutorials by Ujaval Gandhi.

Free tutorials on the semi-automatic classification plugin that turns QGIS into remote sensing software.

Introduction to QGIS Python programming for non-programmers. By Anita Graser.

Many free tutorials on open source for groundwater modelling.

Recipes for Catchment Hydrology and Water Management. By Hans van der Kwast & Kurt Menke.

A Workbook for Classroom or Independent Study. By Kurt Menke.

Learn how to use QGIS 3 to take your cartographic products to the highest level. By Anita Graser and Gretchen N. Peterson

Un libro libre de Víctor Olaya.

The MapScaping Podcast is a weekly podcast featuring interesting people doing amazing work in the geospatial world. 

The Geomob podcast discusse themes from the geo industry, interview Geomob speakers, and provide regular updates about projects. They publish a new episode every week.

Videos with tutorials, webinars and lectures on QGIS, Input, PCRaster.

A great resource of useful QGIS videos and much more.

Hatari Labs YouTube Channel on GIS, Python and modelling for groundwater.

Tutorials and tips From GIS to Remote Sensing, especially for open source software.