Office 365 Developer team announced a new Office 365 Developer Program for developers working with Office 365, SharePoint, the Office client… anything related to Office!
By signing up you get a Free Office 365 Developer Tenant! This is a free one-year Office 365 tenant.
Additionally Microsoft sends you monthly newsletter with all updates and training related information.
You can download the visual studio 2013 community edition which is absolutely free (equivalent to Visual studio 2013 professional edition) from the following link.