Rack showing the first Eurorack module released by each manufacturer between 1995 and 2009:
1995, Doepfer, A-100 System
1998, Analogue Systems, RS Integrator
2004, Voxglitch, CV Pattern Generator
2005, Plan B, Model 15 VCO
2005, Livewire, Frequensteiner
2006, Cwejman, VM-1
2007, The Harvestman, Malgorithm
2008, Make Noise, Moddemod
2008, Tiptop Audio, Z5000
2008, Toppobrillo, Triple Wave Folder
2008, Bubblesound, SEM20 VSF
2009, Metasonix, R-52
2009, WMD, Geiger Counter
2009, Hinton Instruments, Switchmix (42hp, not shown)
2009, Synthesis Technology, E-340
2009, Synthwerks, FSR-1
Source: Modwiggler thread "Timeline History of Eurorack?" by bouzoukijoe1
https://modwiggler.com/forum/viewtopic.php?t=68605
Other noteworthy dates:
2001 First Superbooth at Musikmesse
2006 First post on Muffwiggler
2012 Modulargrid announced
2012 First Knobcon
2013 First DivKid video
2014 I dream of wires
2015 Mother 32
2016 First standalone Superbooth in Berlin
2021 10,000 3U modules on Modulargrid
For corrections, please leave a comment!