There are several places explaining app permissions and their possible implications, or helping you find "privacy friendly" apps. One example for that is my own Android site¹:
- the permission overview lists permissions and tries to shed some light on what they are intended for, and how they might potentially be abused
- being part of the app listings, the Permission Checker list shows you a few candidates you can use to check apps you've already installed on your device. They give different details on the permissions used and their explanations. Ad-Modules and Privacy Checker again give you details on what modules are used, what they are for, and sometimes also some background on the networks behind them (and their "trustworthiness").
- the app search lets you search apps by categories and permissions – to eg. find dialer apps without Internet access, or inventory apps with NFC; you decide the combination. It also lets you filter out (or restrict to) paid apps, and more. Note it of course is restricted to apps listed on the site – which currently covers about 14k apps available on Google Play, F-Droid, my repo, Aptoide and/or the Xposed repo.
- the article section gives useful background on things like above mentioned "tracker modules" and other privacy related issues.
Disclosure again in bold: that site is owned by me, was built by me, and still is maintained by me. Which somehow makes it a one-man show. I try my best to keep it up-to-date (applists update themselves automatically) and bring in new/fresh content, but I have my limits :)
Last but not least a general hint: to ensure as best as possible you only get "clean apps", use F-Droid as your app source whenever possible. They have very strict rules to ensure the quality (one reason their collection is not that big). My own F-Droid repo doesn't reach that level (always check with its web browser interface for details the F-Droid client app does not show here) – it's rather intended as a "stepping stone" for projects not (yet) meeting the F-Droid criteria fully.
¹ originally setup to redirect the off-topic "is there an app…" questions here with a useful hint
² a feature provided thanks to AppBrain who granted me access to their data