https://pippinbarr.com/it-is-as-if-you-were-on-your-phone/info/

Want to be on your smartphone and do nothing at the same time? Not in the hyperbolic sense, actually nothing. You could call it meditating or avoiding social contact, however you look at it, this site got a great laugh out of me when I realised its purpose, or perhaps lack thereof.

https://kiwix.org/en/applications/

From the most useless link to the most useful: this is Kiwix, a platform to behold. Distributing knowledge everywhere, Kiwix brings the power of the internet to the offline world. Having support for all platforms, even a Raspberry Pi can be used to create a local copy of Wikipedia, Stack-Overflow, iFixit or any other treasure trove of digital knowledge.

https://github.com/Stirling-Tools/Stirling-PDF

As a versatile tool for distributing a formatted document, PDF's are a great solution. They also come with a lot of frustrations, some security related, some editing related. Stirling PDF is a self-hostable PDF manipulation tool. Providing a way to edit, add, merge, secure, watermark, OCR and much more. Depending on your workload, it could just be a must-have.

https://thenostalgiamachine.com/

Travel back in time to any nostalgic era with ease using this link. Provide them with a year and it'll spit out a list of clickable songs with their accompanying era accurate videoclips.