Oroborus

From the introduction:

Oroborus is a roleplaying game of many possibilities. It is simple, concise and highly adaptable so that it can be used in any setting. The mechanics are flexible and easy to understand so that you need to know only a few rules to handle many situations. It is equally useful if you already have a campaign and are looking for clear, practical rules or if you are planning on developing an original campaign for almost any setting. Oroborus emphasizes character-based roleplaying and encourages players to create and play interesting and complete characters in any setting.

User summary:

Three major settings were planned for publication and enjoyed some development, including cover art and advertising. They apparently were never published, however. They included: By the Gods (Mythology); Shakespearean Adventures (Elizabethan England, multiple volumes); Dark Albion (Dark Fantasy and crime in Victorian England).

Oroborus was intended for commercial publication and sales. When this proved impracticable, however, the game and supplements were published as freely accessible HTML.