Sia has many uses. Any time you want to store information to be found again later. The information is stored as it is structured: lists, trees, items in multiple lists, and items linked together, e.g. Fred - account manager -> Barney. Be authoritative with all your information at your fingertips. Sia can handle tens of thousands of items, that is hundreds of thousands of words. Sia is great for brainstorming and requirements gathering, you can not run out of space. It is also good for mapping out any complex system such as networked software.
Sia abridged features:
Easy and fast to use, hit space to add a new item. Right click to see options. Drag and drop items.
Powerful, and can store many thousands of items.
If one is ever left without Sia one can still read one's information in a web browser,
even if the document is encrypted.
Items can be colored for clarity.
Sia is free for personal use, If you find it also useful at work please purchase a licence.