At work I have to interact with a complex project management system. It allows beta testers and the support team to raise items, as Bugs or Enhancement Requests, and for that item to flow all the way through our system until it's refused or released to our public build. It has a million moving parts, but it doesn't provide a way for me to manage the work assigned to me.
As a response I've designed a tool that is a little bit of a diary, and a little bit of a sketchpad, and a little bit of a daybook. I'm calling it Job Manager because it doesn't need a name. It's fairly simple, (because our project management system already handles the complex stuff) but I find it helpful to keep track of all the little things happening across multiple projects.
It's downloadable from GitHub as a public repository - just in case someone else wants to be a bit more organised without much effort.