Restic is a modern backup program that can back up your files:

from Linux, BSD, Mac and Windows

to many different storage types, including self-hosted and online services

easily, being a single executable that you can run without a server or complex setup

effectively, only transferring the parts that actually changed in the files you back up

securely, by careful use of cryptography in every part of the process

verifiably, enabling you to make sure that your files can be restored when needed

freely - restic is entirely free to use and completely open source

Free pipe organs

You can click around on different letters to see the words that use that letter in that particular position.

Rubik's cube useful information, including code.

Epoxy for garage. Arizona Polymer Flooring - 400 (sold as 450 here).

Generate unique images from any text. Robohash is a easy web service that makes it easy to provide unique, robot/alien/monster/whatever images for any text.
Put in any text, such as IP address, email, filename, userid, or whatever else you like, and get back a pretty image for your site.

Counting bits (popcount), swapping bytes/endian (bswap32) and other compiler intrinsics.

Netflix speed test.

Easy file sharing from the command line