Wikipedia
MashApps
MashApps are process-centric cloud applications for small and medium enterprises and departmental deployments. MashApps can be used to solve different types of business problems within an enterprise. Integrations with third party applications, both on-premises and on-demand systems can be modeled without much dependency on the IT team. Mashup applications can be shared between users or organizations.
Users looking for MashApps for their business scenarios can either build it themselves or look for similar solutions that are readily available on the Google Apps Marketplace.