To add to this list

scheduling+browsing https://forum.restic.net/t/backrest-a-cross-platform-backup-... (Golang webUI supporting Linux and MacOS).

A number of others are findable through the community section of the forum.

Bit of a self plug, I author Backrest. The most significant challenge historically has been that restic has poor programatic interfaces but in recent revisions the JSON API (over stdout) has largely stabilized for most commands.