While there are no absolutes when it comes to taste. One design language that I really like is the Atlassian/Bitbucket one. https://atlassian.design/guideline

While there are no absolutes when it comes to taste. One design language that I really like is the Atlassian/Bitbucket one. https://atlassian.design/guidelines/brand/color-1 https://atlassian.design/guidelines/brand/color-1 I've generally really liked the changes to bitbucket over the last few years in terms of UI and UX. They also have an impressive component archive. https://atlaskit.atlassian.com/packages https://atlaskit.atlassian.com/packages A lot of the packages are under an Apache 2 license, I can't say all as I haven't looked but the master repo is Apache 2.0 as well.