Releases on December 21st, 2020 and before

dockerhub
ruby on Docker Hub 3.0.0-rc1-alpine3.12 3.0.0-rc1-alpine 3.0-rc-alpine3.12 3.0-rc-alpine
dockerhub
parity/polkadot on Docker Hub master-0.8.27-e21f5ce-66864afb
npm
fomantic-ui on Node.js NPM 2.8.8-beta.101
github
ampproject/amphtml on GitHub 2012212324000
dockerhub
linuxserver/emby on Docker Hub beta-4.6.0.10-ls71 arm64v8-beta-4.6.0.10-ls71 arm32v7-beta-4.6.0.10-ls71 amd64-beta-4.6.0.10-ls71
github
k3s-io/k3s on GitHub v1.20.0+k3s1
dockerhub
minio/minio on Docker Hub 11150-aeb4dd9
dockerhub
jellyfin/jellyfin on Docker Hub 20201221.12-unstable 20201221.12-unstable-arm64 20201221.12-unstable-amd64
dockerhub
nextcloud on Docker Hub 21.0.0beta2-fpm 21.0.0beta2-apache 21.0.0beta2
Maybe you can find something interesting in this list