Nobody here is doing it wrong. Each project picked what mattered most to it, and every choice gives something up.
Eleven
Run the original code
Keep Tiny Speck's own server code and Flash client, and rebuild only the pieces that were never released. Every rule, number and line of dialogue is the real thing. The catch is how much was missing: the host that ran the code, the login and auction web app, and a client that depends on Flash.
Children of Ur
Rewrite it for the browser
Port the game to a new language (Dart) so it runs in any browser without Flash, and rebuild the systems one by one. That freedom made room for new areas and storylines; the cost is that every system has to be re-created by hand.
Odd Giants
Remake it in a modern engine
Build a new Unity client with its own servers, bring back the original world and add new features along the way. Players get a shared, living world today with regular releases. It is a desktop download, and the code is not public.
Groddle Afternoon
Rebuild it for the web, solo or together
Follow the released server code rule by rule in a web game you open in a tab. Solo needs no account and no server: saves stay in your browser, and group activities are adapted for one. Multiplayer adds a small server for the parts other players share: the street, chat and groups, buddies, parties, quoins, rocks and trees, races, Rook fights, Feats and street projects, Hi signs, visiting each other’s homes, trading, gifts and the auction house.
Together or alone
Glitch was a social game. A project with servers can bring back chat, trading and Feats, but someone has to keep those servers running. A single-player game can be published as plain files and keep working for years, without the shared world. Groddle Afternoon offers both: solo is plain files, and multiplayer is the part that needs a server.
Flash, browser or download
Flash reached its end of life in 2020. Keeping the original client protects every detail of the old interface; a browser rewrite opens in a tab; a desktop build escapes the browser's limits but asks players to install it.
Open or closed
Eleven and Children of Ur publish their code under the MIT licence, so others can learn from it and carry it on, and so does Groddle Afternoon, on GitHub. Odd Giants keeps its code private.
The same gift
All of them stand on Tiny Speck's 2013 release of Glitch's art, music and server code under CC0. None may use the Glitch name or logo, which were not part of it.