devise-passwordless by devise-passwordless

Extension for devise, enable login as functionality. Add link to the masquerade_path(resource) and use it. Maintained by oivoodoo on GitHub, where it has earned 552 stars from the community.

Let devise support multiple emails (authenticatable, confirmable and validatable). Maintained by allenwq on GitHub, where it has earned 79 stars from the community.

Easy multi-tenanting for Rails5 (or Rails4) + Devise. Maintained by jekuno on GitHub, where it has earned 339 stars from the community.