Last tested: Aug 13, 2020
Examples of repos that can be installed through Marketplace:
https://github.com/ContrastingSounds/vis-report_table
https://github.com/noahamac/viz-inspector
https://github.com/looker/viz-multiple_value-marketplace
If nothing else works: https://github.com/looker/custom_visualizations_v2
This content is subject to limited support.