Eaglercraft: 188 Client
Since is a fan-made, browser-based port of Minecraft, it doesn't have an "official" feature list in the way a commercial product does. However, based on the most requested and community-developed features for this specific client, Proposed Feature: Enhanced Offline Persistence & Sync
Accessing the client is straightforward. Since it's a web-based tool, you generally have three ways to play: eaglercraft 188 client