Overview
I had an opportunity to try CollectionBuilder, so here are my notes.
https://collectionbuilder.github.io/
It is described as follows:
CollectionBuilder is an open source framework for creating digital collection and exhibit websites that are driven by metadata and powered by modern static web technology.
Output
The following is the site I built as a prototype using CollectionBuilder.
https://nakamura196.github.io/collectionbuilder-gh/

The repository is here:
https://github.com/nakamura196/collectionbuilder-gh
The same data from the following article was used.
Specifically, the “Bird’s-Eye View of Buildings in the University of Tokyo Main Campus and Faculty of Agriculture” (held by the University of Tokyo Agricultural and Life Sciences Library) was used as sample data.
https://iiif.dl.itc.u-tokyo.ac.jp/repo/s/agriculture/document/187cc82d-11e6-9912-9dd4-b4cca9b10970
Impressions
I was able to build a site like the one above by simply modifying the metadata (demo-metadata.csv).
It also provides rich features such as maps, timelines, facets, and tag clouds.
I also appreciated the high degree of customizability through markdown files.
Summary
I found it to be a useful tool for building digital collections as a static site, rather than a dynamic site like Omeka.
There are many aspects I have not fully explored, but I hope this serves as a helpful reference.