Eaglercraft is an open-source, JavaScript-based port of Minecraft designed to run entirely within a web browser. While newer versions exist (such as EaglercraftX, which runs 1.8.8), the version refers specifically to a stable port of Minecraft version 1.7.2, commonly known as "The Update that Changed the World" in the original game's history.
Utilize standard texture packs and custom player skins via URL linking. How to Play Eaglercraft 1.7.2 eaglercraft 172