Here follows a quick timeline of UO emulators, based on facts, fiction and wild guesses, numbered from first to last. I've included any dates I've been able to dig up, as well as the current (when I checked) homepages that exist for the various emus. Feel free to point out any flaws by contacting me at email@example.com.
(1)UOX -> (2)UOX2 -> (4)UOX3 -> | |->(10)UOXGold | |->(11)AUOX -> (12)AUOXCON | |->(14)Wolfpack | | | |-> (15)Sunshine/Sushix | | | |-> (17)NOX-Wizard | | | | |-> (26)Revelation | | | | | |-> (37)equinox | | | | | |-> (32)Hypnos | | | |-> (18)Lonewolf | | | | | |-> (21)UO-Inside Out | | | | |-> (22)Method | | | | |-> (41)Werewolf | | | |-> (19)Shard Emulator | |->(13)UOX-pi | |->(14)LoC | |->(20)UOX Classic | | | |-> (30)UOX:NG | |->(25)Middle-Earth Custom UOX | |->(29)UOX3 "Unofficial" | |->(44)uoOS (3)Fuse | |-> CFuse | |-> Thayland's Fuse | |-> FuseX (5)UOR (6)NWO/UOAWEUnnamed (7)Grayworld -> TUS -> SphereServer |-> 56d (Main branch) | |-> Sphereserver X | |-> 1.0 (Dead end) (8)UOOS |-> (Swords, never finished?) (9)POL (10)Trespasser -> Hellfire -> Hybrid (16)Epsilon (23)Atum (24)Tupi (27)RunUO | |->(37) RunUO-RE (later renamed RuOSI) | |->(39) SunUO | | | |-> (??) GeNova Project | |->(44) ForkUO (later renamed ServUO) | |->(47) JustUOa> | |->(48) XRunUO | |->(50) ModernUO | |->(51) ServUOX (28)SteamEngine (31)MyUO (33)Psychotropic (34)AUOE (35)Athena (36)Canera-Project (40)Ultima Online: Shattered Legacy Server (42)UO:98 (43)JUOServer (46)JPhex Server (49)UltimaPHP
1.) Jaegermeister (Denny Zuko) creates the first version of UOX (Ultima Offline eXperiment) for the pre-alpha UO client. According to Wintermute on the Exult forums, Jaegermeister originally got the decryption key for the client from some friends at OSI and worked from there. The project was then abandoned in light of the upcoming beta/release version of the client.
2.) Marcus Rating / Cironian creates UOX2, rewriting UOX from scratch
3.) Fallo (Erik McClenney?) creates FUSE, a server expandable by user-made DLL-addons, such as CFuse, Thayland's DLL, and FuseX (by Craz).
4.) Cironian redoes UOX2, and the first public UOX3 version (0.37) is released Oct 22. 1997.
5.) UOR - Ultima Online Revisited, by Marc A. Pelletier / Coren. A newsgroup message from Feb 27, 1998 (archived on Google Groups) indicated the author had at that point been working on UOR for three months, i.e. started at the tail-end of 1997. UOR ran on UNIX, but was written with portability in mind. Like UOX3, the intention was to allow connections to UOR with official UO accounts.
6.) A bunch of other UO servers that never really took off generally come to a halt when Cironian releases source for UOX3, including; New World Order, UOAWE - started Feb 9, 1998, by Gabriel, and An unnamed UO Server by Erwin S. Andreasen.
7.) Menace creates Grayworld early in 1998. It eventually evolves into TUS (The Ultimate Server), which again evolves into Sphere (aka SphereServer) around April 2000). A fork (SphereServer X) has been maintained alongside the main branch since 2016. For a more in-depth look at the history of Sphere, check out History of Sphere by Soulless!
8.) Sheppard creates UOOS - the first object oriented UO emu, or something.
9.) Eric N. Swanson, aka Syzygy, creates POL in the summer of 1998.
10.) What was later to become Hybrid was started sometime in 1998, around the time when the source for FUSE was released, and back then it went under the name Trespasser. Later it changed name to Hellfire, before being renamed as Hybrid.
11.) Armageddon makes his own version of UOX3, named AUOX, causing the first "branching" of any UO emu to occur :P
Some other people start working on another branch of UOX3, which they call "UOXGold".
12.) SpaceDog continues Armageddon's AUOX through "AUOXCon"(tinued)
13.) Lord Binary does his own version of UOX3, called UOX-pi - later to be merged into Wolfpack.
14.) Ripper's customized UOX3 code grows into Wolfpack, while Chaos's customizations become Legions of Chaos
15.) Sunshine, a derivate work of an early Wolfpack version, is started by M. Strobl sometime in 2000. In 2003, version 3 of Sunshine is reforked from Wolfpack, because of memory restraints/unreadable codebase in the original fork. The successor of Sunshine, Sushix, is never officially released.
16.) Epsilon is started by Kair in May 2001
17.) NOX-Wizard is created by xan using Wolfpack as base (25. June 2001)
18.) Wolfpack development splits in three (see below) as some WP devs pack up and start Lonewolf on November 9th, 2001.
19.) Shard Emulator, a Wolfpack v12.6 based emu, is started at the same time as Lonewolf.
21.) UO-Inside Out, a Lonewolf derivate started by Skyfire?, releases it's first version in early January.
22.) Method, a project derived from Lonewolf, is started by Melchir in early February 2002.
23.) Atum, a russian developed UO Emu, has it's first release in February 2002. It's closed source, and has no released packages.
24.) Version 0.1 of Tupi, a server written in Java, is released on the 4th of February 2002 by speka/dalzhim.
25.) Middle-Earth Custom UOX, a fork of UOX3 by Sargo, sees its first release on February 11th, 2002.
26.) Revelation, based on NOX-Wizard, enters the scene, on Aug 21st, 2002.
27.) Krrios reveals RunUO in early september 2002 - the first UO emu written in C#. Official development ended in August 2014, after nearly 12 years.
28.) Shadowlord starts working on SteamEngine, an open-source UO emu mimicing Sphereserver's functionality, on Sept. 29th, 2002.
29.) punt starts up UOX3 "Unofficial" on the first day of 2003, intending to rewrite the "JS"UOX3-version.
30.) UOX:NG - derivate work of UOX-Classic, started with big-endian 64 bit machines in mind, by Generic Player
31.) MyUO is created by Fabrizio Montesi, in October 2003.
32) Hypnos: UO Server Emulator, a fork of NOX-Wizard by Diego Elio Pettenò (Flameeyes), has its first CVS commit on 28th of December, 2003. Goals: To combine the power of UOX and the ease-of-use of Sphere, with a dynamically loaded, python-based scripting engine.
33.) Psychotropic - A successor project to Hybrid, is started in December 2003 by Ian McNealy
34.) The initial revision of the source for AUOE (Advanced Ultima Online Emulator) is submitted to SourceForge on the 2nd of March, 2004, by f0xfire
35.) Athena - started March 10, 2004 by Kair
36.) Canera-Project - closed source project started 03-15-2004 by Sargo
37.) equinox - spin-off from NoxWizard makes it appearance on SourceForge on the 19th of September 2004
38.) Initial version of RunUO-RE (Russian Edition) is released to the public on New Year's Eve in 2004 by Wyatt, as a fork based off of 3rd party decompiled sources for the then closed-source RunUO, though it was later migrated over to the open-source version of RunUO. Eventually, from version 1.5.0 (with UO:SA support), it was renamed to RUOSI. Supports enhanced client and all expansions.
39.) Max Kellermann forks SunUO from RunUO on February 5th, 2005. It runs on Mono 1.1 (Linux, FreeBSD) out of the box.
40.) First release of Ultima Online: Shattered Legacy Server occurs on May 30th, 2005, by Maximilian Scherr (Max), though it had been under development on/off since summer 2002, and included a rewrite from scratch in 2003. It's intended for the Alpha version of the Ultima Online client.
41.) Zagyg starts Werewolf - based on Lonewolf - on December 7th, 2005.
??.) GeNova Project receives first commit on Google Code on January 8th, 2008, by souzaemarcal. It's a Brazilian SunUO/RunUO fork with focus on UO:KR support, Mysql databases and more. Last commit on November 12th, 2008.
42.) UO:98 is released on December 7th 2011, by Batlin. It is a port of the UO Demo server into a fully functional multiplayer UO server.
43.) JUOServer makes its appearance on SourceForge on January 22nd 201, as a Java-based Ultima Online server.
44.) uoOS (uo Old School?), puts up the first public version of its source-code, which is a branch off of UOX3 0.9x
45.) ForkUO (Originally called WalkUO?) is forked from RunUO at Google Code on September 5th 2012 and then later moved to Assembla. On March 19th 2013 the project was renamed to ServUO
46.) JPhex Server - a combined server and client emulator for Ultima Online: Shattered Legacy (UO Pre-Alpha version) - was created and committed to Google Code on Oct 13th, 2013, by Folke Will. Can now also be found on GitHub.
47.) JustUO, a fork of RunUO by Dian, is uploaded to github on October 17th, 2014
48.) XRunUO - Forked from RunUO by Pedro Pardal (ppardalj/Semerkhet) in late 2005 and originally developed for the UO Legends shard with expressed intention of having full support for Stygian Abyss expansion. Source released to the public on July 22nd, 2015.
49.) UltimaPHP - an open-source UO Server written in PHP 7 - has its first code committed to github on Aug 8th, 2015, by João Escribano
50.) ModernUO -a fork of RunUO by Kamron makes it debut in 2017. The goal of the fork was performance, the elimination of classical "world saves" and support for millions of objects and thousands of players.
51.) ServUOX - a fork of RunUO by Frazurbluu and Malroth, receives its first commit on GitHub on March 26th, 2020
Servers not placed in timeline as of yet(any info about these will be appreciated!):
?.) LCUOSE, based on UOX3, lives a short life and decays quickly.
?.) LOP makes a short entrance, but doesn't stay for long.
?.) UO Free
?.) Ethereal Void was a project to create a server for the pre-alpha version of UO. Information about how successful this was is lacking.
?.) RUOSI - a Russian-based fork from RunUO.
?.) UWE - Ultima Worlds Emulator, scripting module in python, active around March-April 2001? Jeff Gass/Cyborstinger?
?.) BK-UOX/Quetzal16 - Offshot from UOX3, customized for the Italian shard Britannia Kingdom. Eventually evolved into Quetzal16, then replaced with Quetzal32 (non-UOX based). https://web.archive.org/web/20060510120052/http://quetzal.igz.it/main_it.html
UOX3 - 22.Oct 1997 - by Cironian (Markus Rating)
Grayworld - Early 98 - by Menace
UOAWE - Monday Feb 9, 1998 - by Gabriel
POL - Summer 1998 - by Syzygy
Hybrid - 1998 - by McNealy, Sean Rose and Cycline3
UOX-pi - 8th Jan 2000 - by LB
Epsilon - May 2001 - by Kair
NoX-Wizard - 25.June 2001 - by xan
Revelation - August 21st 2001 - by ???
Lonewolf - 9th November 2001 - by LB & ???
Shard Emulator - 9th November 2001 - by frazurbluu
UOX-Classic - Nov. 17, 2001 - by Sargo
Method - February 10th 2002 - by Malchir
Atum - February 2002 - by Ramsess
Tupi - February 4th 2002 - by Guilherme Lanius (speka)/Gabriel Abut-Lussier(dalzhim)
RunUO - September 2002 - by Krrios
SteamEngine - 29. September 2002 - by Shadowlord
UOX3 "Unofficial" - 1st January 2003 - by punt
UOX:NG - September 2003 - by Generic Player
MyUO - October 2003 - by Luxor (Fabrizio Montesi)
Hypnos: UO Server Emulator - December 28th 2003 - by Diego Elio Pettenò
Psychotropic - December 2003 - Ian McNealy
AUOE - March 2nd 2004 - f0xfire
Athena - March 10th 2004 - by Kair
Canera-Project - March 15th 2004 - by Sargo
equinox - September 19th 2004 - by prisonernumber7
RunUO-RE/RUOSI - December 31st 2004 - by Wyatt
SunUO - February 5th 2005 - by Max Kellermann
Ultima Online: Shattered Legacy Server - May 30th 2005 - by Maximilian Scherr (Max)
Werewolf - December 7th 2005 - by Zagyg
UO:98 - December 7th 2011 - by Batlin
JUOServer - January 22 2012 - by daneel_olivaw
uoOS - July 11th 2012 - by Xantier
ForkUO - September 5th 2012 - by AugmentedInsanity. Renamed to ServUO on March 19th, 2013
JPhex Server - October 13th 2013 - by Folke Will
JustUO - October 17th 2014 - by Dian
XRunUO - July 22nd 2015 - Pedro Pardal
UltimaPHP - Aug 8th 2015 - by João Escribano
ModernUO - 2017 - by Kamron
ServUOX - March 26th 2020 - by Frazurbluu and Malroth