Interesting and inspiring online resources

Non-technical

brain.fm - music which helps you to focus
freepik - lots of free graphics to use
Around The Corner - How Differential Steering Works - a documentary recorded in 1937 (it's before WW2!). This is the best video about differential I have ever seen, and the first one which allowed me to really understand how does it work.
Recording of the voice of Józef Piłsudzki - Voice of Józef Piłsudzki, recorded on Sep 5th, 1924 (that's almost 100 years ago!)
ASCII Arg Generator - generator of ASCII Art texts