Brave Browser is a browser with integrated privacy features, ad-blocker and rewards for their users (unfortunately in BAT token 💩).

Presearch is a decentralized search engine where you can stake (unfortunately PRE token 💩) for certain keywords, which allows you to get a top search result spot for that keyword (think: advertising) as well as user rewards.

Both have great concepts imho and would be awesome if they were running on lightning.