As mentioned on the Aquarium, the WebSocket protocol, often described as one of the key elements of HTML5, has finally been blessed (RFC 6455).
Which WebSocket server implementations are available for Delphi?
- Delphi on Rails (Google Code, Mozilla Public License 1.1)
- Delphi Web Socket (Google Code, based on Indy 9, New BSD License)
- WebSockets Delphi Components (commercial, Indy 10, Delphi 7 to XE5)
It is implemented in Delphi on Rails, it support old and new WS protocol. http://code.google.com/p/delphionrails/
Try IPworks for Delphi, they have nice quite of interoperable components (paid, not free).
https://www.nsoftware.com/ipworks/ws/#plat-delphi
Here is 2 more projects:
Newer version of Indy implementation by André Mussche (the author of AsmProfiler) can be found here.