What you are looking for is in Settings > Community Plugins > Browse community plugins. These are all the plugins that have passed review. When browsing, it is easy to search for terms such as “todo” or “graph” to narrow down the search. Selecting a plugin from the left side of the panel will focus on it and on the right side you have the developers detailed explanation of the plugin’s feature set.
@EleanorKonik’s Obsidian Roundup also frequently covers newer plugins that have not passed review yet, and she has a non-exhaustive list of plugins organized in categories.