Probably the best tool you have is somewhere to write your notes down. What you did, why you did it, how to reproduce it. That saves you time in a year or two when you go 'hmm I did something like this before have to do it again because some CPU ate itself'. My old notes have saved me a lot of re-work over the years. Because I had written down what I did so I do not have to rebuild it. I can just skip along the notes and be most of the way there.

This bit seems to hold true across any size team for me. If I have notes I can spiffy them up and make cheat sheets out of them and bootstrap other developers faster. Or if it is just me, my feeble brain will forget odd details that I needed for something.