I made a Logger that logs to slf4j. This is to optionally replace default logging that prints to stdout / stderr. This is specifically useful when liquibase is run inside an application (servlet or spring).
Great! The liquibase.org/extensions site is designed as a wiki where you can add a reference to your project so others can find it. The github.com/liquibase extensions are ones I have developed and managed. The extension portal should be the main list of available extensions, regardless of who wrote them.