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I have weighted raster data converted from polygons with different categories.

I have ArcGIS with 3D Analyst extension, unfortunately do not have Spatial Analyst, and I would like to use QGIS to make weighted sum overlay analysis, probably using ordered weighted averaging.

I found some similar questions but nearly all explained vector overlay analysis. Here grids (tif, img etc) will be used.

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SAGA has an Ordered Weighted Averaging tool which lets you import grids as an input. You can access this from the Processing Toolbox:

Ordered weighted averaging tool

The QGIS documentation for this tool appears blank, but there is some information in the SAGA documentation.

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