Data catalog tools work with data catalogs to make them more efficient. Data catalogs typically come with tools included as part of the data catalog package. The tools included with data catalogs have been developed to support data quality, analytics, and compliance with data privacy regulations. Unfortunately, the number of independently sourced tools for data catalogs is essentially nonexistent.
Generally speaking, the independent tools described in various articles as supporting data catalogs are data analytics platforms, which use the data catalog as a tool.