ZeroMe - Social network for the distributed P2P network ZeroNet.
Frost for Facebook - Frost is a third party Facebook wrapper geared towards design and functionality
GNU social - GNU social is communication software for both public and private communications.
Face Slim - Web App for Facebook. Lightweight, ad-free, chat support and modern look.
Pleroma - Pleroma is a free, federated social networking server built on open protocols.
Facebook Lite - Facebook Lite is a light and small size app that contains all the classic features of the Facebook app such as timeline, liking or commenting on photos and other such simple features.