This is the best software for professional prototyping. It has numerous features to create libraries and templates elements, allows a fairly advanced editing actions, movements and effects.

Fully featured app with robust tools to customize and manage work across projects and across your team. Easy one-click uploading to Axure's free Axshare site to host protected prototypes and solicit feedback from stakeholders. Great auto-saving and restoring from auto-backups help you out of infrequent crashes.

It's free for students, easy to get start and Axure share function make it easily for user testing. Fully functional with lots of interaction, widgets and kits library resources online. Easy copy and paste from different project with interactions.