HackerOne

HackerOne (https://www.hackerone.com/) is a similar platform – it has its own point system (reputation) and also calculates a variety of metrics that it uses as the basis for its Leaderboard and for invitations to its own private programs.

Like Bugcrowd, it also has a bug bounty policy for itself – if you find a vulnerability in one of its sites or apps, you're entitled to a reward. Interestingly though, you might still be entitled to a reward even if you don't discover a bug. From their site:

This is an usual policy that still makes sense: providing a detailed list of everything that worked is its own audit of the company's resources, even if it doesn't cover any vulnerable areas.

HackerOne and Bugcrowd both have a similar breadth of different companies, with different products, business models, and security needs. HackerOne does have a few notable companies that are exclusive to its platform, most notably Twitter, but generally the offerings are very similar.