Case study

ClassicUO: Ultima Online Classic Client reimplementation

ClassicUO recreates the Ultima Online Classic Client in C# on FNA-XNA. Its source includes game asset loaders and client logic for a separately obtained installation, and the authors describe testing primarily against free shards.

Targets: Game
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06

Stars: 742
Last commit: 2026-09-29
Language: C#
License (GitHub): BSD-2-Clause

GitHub data as of 2026-11-09

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Requirements & limits

Prerequisites: Requires a legally obtained copy of the Ultima Online Classic Client.
Limits: The client is under heavy development and is primarily tested against free shards.
License: LICENSE.md states BSD-2-Clause, while README.md states BSD 4.

Cite

BibTeX

@misc{classicuo-case,
  title = {{ClassicUO: Ultima Online Classic Client reimplementation}},
  howpublished = {\url{https://github.com/ClassicUO/ClassicUO}},
  url = {https://github.com/ClassicUO/ClassicUO},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/classicuo-case/}}
}

Plain text

ClassicUO: Ultima Online Classic Client reimplementation. https://github.com/ClassicUO/ClassicUO (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/classicuo-case/

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Primary sources

README.md GitHub · ClassicUO/ClassicUO · Revision ee79d7e