Lucidchart is a amazing app. It allows you to make mockups, diagrams, mindmaps, and many more other things.
The Lucidchart logo
The UI (user interface) is also very simple and easy to use, and you can quickly make graphs, mockups, venn diagrams and more easily in Lucidchart. If you are PRO user, you get 1 gigabyte of space, which is plenty of space even if you are a power-user. It is also very easy to add your own images, and find images on Google, Flickr and Facebook.
An example map open in the Lucidchart desktop software
One of the best thing Lucidchart offers for students is the option to have PRO accounts for free. This gives you more space, email and web support, wireframing and mockups, revision history and many more features; all for free (if you are a student or professor)!
All of my BCS school notes in Evernote have mindmaps which were made in Lucidchart
Lucidchart is also great because it is available offline. This is very helpful if you are a student and want to do brainstorming or a mockup on the bus, train, or in areas with no wifi connection. To get the offline software, you need to download the Chrome app here (Google account required). You can also use Lucidchart on your browser, but internet connection is required.
The Lucidchart shortcut on my desktop
Lucidchart also offers a publication suite, Lucidpress. It also offers free accounts for students.
Lucidchart is a great piece of software for students and non-students alike. Its great for making your notes look better, for mindmapping and for mockups. I would defiantly recommend this piece of software.