Here's some stuff for you (as a present from me!). I like to create things, so these are some things that may, or may not, help you create things too.
* if you don't wanna wait to create - only CC0 assets
* a decent pixel art maker in PHP
* notes - For you who have your own web server with PHP. A simple note taking app who's strength is the extremely simple HTML that makes it work on all browsers on all devices without hassle. Its weak security is also one of its strength, because it makes it fast and stable (security means things have to get complex, and complexity makes things unstable...). See also: calendar
Footnote: I also believe that the best way to be productive and creative is to invent your own tools. So maybe it's better if you do that instead of checking out this list. I may write something about this in the future. Inventing stuff yourself means NOT following others ideas and ways (because they only take you so far, even if they may give you a head start at first. inventing your own ways makes your possibilities limitless, if you have the patience) and it's hard to give advice on that because the point is to make your own advice. But I'll still try to give some advice on it on some level.