What is meant are GitHub pull requests for the Cleodora project.

Making, tracking and improving personal forecasts (e.g. the weather tomorrow or your salary in 2 years).

https://github.com/cleodora-forecasting/cleodora

Useful is simply defined as: It will be merged.

People/person is any GitHub user, unless that user clearly is a bot. GitHub users will be assumed to be distinct unless they clearly are not.

It is enough for the PRs to be open, they don't have to be merged for this market to resolve.