The official Google Picasa client libraries help to write applications with the Picasa Web Albums Data API. Users can upload and share photos on Google+, tag friends, and filter images. Picasa is available for download.
Mashup contests can be a good way to reveal the variety of applications that are possible when the developer community is provided with a quality API. At the recent BarCamp London 5, Stefan Magdalinski, CTO of MOO.com, ran a weekend-long MOO API hack competition. The MOO service and API let users submit custom designs that can be printed onto products like business cards, sticker books, postcards, etc. These products can then be sold through an online store.
To ensure that businesses can efficiently find the documents they need when they need them, cloud storage and sharing service Box recently unveiled a new advanced search API which gives customers and partners the ability to build applications with robust search capabilities.
Video sharing platform Vimeo plans on adding the tus resumable upload protocol to its API in late 2017. The addition of tus to the Vimeo API will allow developers to build applications that provide new ways to upload videos and allow users to upload videos to Vimeo in multiple sessions.