Here are 2 popular ones: Origami and Aragon. But they might not meet all your requirements such as open-source (Origami is not open-sourced yet), slack/discord like features, and white label stuff. Source: about 1 year ago

"Aragon, one of the oldest open-source frameworks for launching decentralized autonomous organizations (DAOs), today announced that it's launching its new tech stack on the Polygon network. Source: about 1 year ago

At Aragon, we believe that digital organizations should be accessible to all, and that's why we're proud to have launched the first DAO framework in 2016. As we continue to iterate and experiment, our focus remains on building antifragile systems that can adapt to an ever-changing world. Source: about 1 year ago

There are a few projects that are working on this. I contribute to a public goods project called DAOHaus. There is also Aragon. Nouns also just released something pretty cool if you like that structure. Source: over 1 year ago

Join us at the Betahaus in Berlin for an interactive discussion about Cryptography, Blockchain, and DAOs hosted by Aragon, the leading platform for building your DAO. Come connect with the growing web3 community at the Betahaus and spread the word about this event! Did we mention FREE pizza, drinks, and swag? Source: over 1 year ago

There is also JPEG View which is really fast and simple image viewer for windows https://github.com/sylikc/jpegview) It is very fast, specially noticeable on very large images. - Source: Hacker News / 3 months ago

JPEGView - lightweight image viewer for Windows. ShareX - screen capture tool with other nice features. Source: about 2 years ago

JPEGView should be close enough to what you want. It's very light-weight. Source: about 2 years ago

JPEGView is great, lightweight and opens stuff fast https://sourceforge.net/projects/jpegview/. Source: about 2 years ago

JPEGView - Lean and fast image viewer with minimal GUI. Source: about 2 years ago