Looking for IH products that improve social media platforms

I am building a list/directory of products that are:

1. made by indie hackers
2. somehow enhance a social media platform like twitter, fb, reddit, yt, snap, tiktok, etc. or multiple such platforms

The app can be an alternative client app, sdk, extension, whatever as long as it meets the above criteria.

If you have built or use a product like this, please add app name and link below. I will help you spread the word about it.