The Salesforce Mobile iOS SDK allows developers control over mobile device features, offline support, data synchronization, and mobile software design. Other features include automation of the OAuth2 login process, allowing integration of OAuth with applications, and access to the REST API with infrastructure classes (including third-party libraries such as the MKNetworkKit library) to facilitate access.
Transloadit offers media upload, modification, and storage as a service for developers who need that functionality (or, as Transloadit's homepage puts it, "geeks who run web or mobile applications") but don't want to worry about it themselves. There aren't too many moving parts to it, but they're ones a lot of applications make use of. The Transloadit API's main functions include: file upload, image resizing, video file encoding, image thumbnail creations, and file storage on Amazon S3.