Opera Unite is described as 'extensible framework that allows for several web services (referred to as "Applications") to be hosted from the user's computer, including a web server for hosting a site, file and photo sharing, a chat room, and streaming media' and is a Photo Sharing App in the Social & Communications category. There are seven alternatives to Opera Unite for a variety of platforms, including Linux, Mac, Windows, Online / Web-based and Android. The best alternative is ownCloud, which is both free and Open Source. Other great apps like Opera Unite are RetroShare (Free, Open Source), Pydio (Freemium, Open Source), Tonido (Freemium) and Woelkli (Freemium, Open Source).
RetroShare is a open source cross-platform, private and secure decentralized communication system. It lets you to securely chat, share photos, videos, and more, using OpenPGP to authenticate peers and .
A full-featured home-hosted Cloud Drive & Personal Assistant. Convert files, create archives, scan for viruses, perform OCR on images or documents, stream media, edit images and more! Compatible with HRC2 Apps!.
FileAgo is a easy and highly secure self-hosted file storage and collaboration platform for companies and teams. Compared to other solutions, FileAgo is an attempt to tackle the collaboration part in a slightly different matter.