- Grzegorz Duczyński (adf88) - General coding (since 1.7.2)
- Albert Hofkamp (Alberth) - GUI expert (since 0.7)
- Matthijs Kooijman (blathijs) - Pathfinder-guru, Debian port (since 0.3)
- Ulf Hermann (fonsinchen) - Cargo Distribution (since 1.3)
- Christoph Elsenhans (frosch) - General coding (since 0.6)
- Loïc Guilloux (glx) - Windows Expert (since 0.4.5)
- Charles Pigott (LordAro) - General / Correctness police (since 1.9)
- Michael Lutz (michi_cc) - Path based signals (since 0.7)
- Niels Martin Hansen (nielsm) - Music system, general coding (since 1.9)
- Owen Rudge (orudge) - Forum host, OS/2 port (since 0.1)
- Peter Nelson (peter1138) - Spiritual descendant from newGRF gods (since 0.4.5)
- Ingo von Borstel (planetmaker) - General coding, Support (since 1.1)
- Remko Bijker (Rubidium) - Lead coder and way more (since 0.4.5)
- José Soler (Terkhen) - General coding (since 1.0)
- Jean-François Claeys (Belugas) - GUI, newindustries and more (0.4.5 - 1.0)
- Bjarni Corfitzen (Bjarni) - macOS port, coder and vehicles (0.3 - 0.7)
- Victor Fischer (Celestar) - Programming everywhere you need him to (0.3 - 0.6)
- Jaroslav Mazanec (KUDr) - YAPG (Yet Another Pathfinder God) ;) (0.4.5 - 0.6)
- Jonathan Coome (Maedhros) - High priest of the NewGRF Temple (0.5 - 0.6)
- Attila Bán (MiHaMiX) - WebTranslator 1 and 2 (0.3 - 0.5)
- Zdeněk Sojka (SmatZ) - Bug finder and fixer (0.6 - 1.3)
- Christoph Mallon (Tron) - Programmer, code correctness police (0.3 - 0.5)
- Patric Stout (TrueBrain) - NoProgrammer (0.3 - 1.2), sys op (active)
- Thijs Marinussen (Yexo) - AI Framework, General (0.6 - 1.3)
- Leif Linse (Zuu) - AI/Game Script (1.2 - 1.6)
- Tamás Faragó (Darkvater) - Ex-Lead coder (0.3 - 0.5)
- Dominik Scherer (dominik81) - Lead programmer, GUI expert (0.3 - 0.3)
- Emil Djupfeld (egladil) - macOS port (0.4 - 0.6)
- Simon Sasburg (HackyKid) - Bug fixer (0.4 - 0.4.5)
- Ludvig Strigeus (ludde) - Original author of OpenTTD, main coder (0.1 - 0.3)
- Cian Duffy (MYOB) - BeOS port / manual writing (0.1 - 0.3)
- Petr Baudiš (pasky) - Many patches, newgrf support, etc. (0.3 - 0.3)
- Benedikt Brüggemeier (skidd13) - Bug fixer and code reworker (0.6 - 0.7)
- Serge Paquet (vurlix) - 2nd contributor after ludde (0.1 - 0.3)
- Josef Drexler - For his great work on TTDPatch.
- Marcin Grzegorczyk - For his TTDPatch work and documentation of Transport Tycoon Deluxe internals and track foundations
- Stefan Meißner (sign_de) - For his work on the console
- Mike Ragsdale - OpenTTD installer
- Christian Rosentreter (tokai) - MorphOS / AmigaOS port
- Richard Kempton (RichK67) - Additional airports, initial TGP implementation
- Alberto Demichelis - Squirrel scripting language
- L. Peter Deutsch - MD5 implementation
- Michael Blunck - For revolutionizing TTD with awesome graphics
- George - Canal graphics
- Andrew Parkhouse (andythenorth) - River graphics
- David Dallaston (Pikka) - Tram tracks
- All Translators - For their support to make OpenTTD a truly international game
- Bug Reporters - Thanks for all bug reports
- Chris Sawyer - For an amazing game!