Hello @RosanaRufer good question and thanks @Robert.Wall for a comprehensive overview of the main dates. I drafted the following with links to some of the original blog posts that might be of interest
History
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OpenEnergyMonitor.org website first launched June 2009 Welcome! - Blog | OpenEnergyMonitor. Open source electricity monitor designs developed and published alongside basic learning resources, some of which are still available in Learn: Electricity Monitoring — OpenEnergyMonitor 0.0.1 documentation.
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emonTx v1, 2010-2011 open source designs but never sold as a kit (Installed in 20 houses near us in North Wales as part of an local energy project).
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emonTx v2, emonGLCD and emonBase based on NanodeRF, March 2012 (OpenEnergyMonitor Shop is open! - Blog | OpenEnergyMonitor).
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Interestingly for historical purposes the first blog post on heatpump monitoring was 2 days after the shop open announcement Heat Pump Monitoring - Blog | OpenEnergyMonitor. We’ve been at this longer than I remember!
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Pre-assembled NanodeRF base station October 2012 Pre-assembled Nanode RF - Blog | OpenEnergyMonitor.
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emonTx v3 & emonTH v1 November 2013 New hardware is in the shop and starting to ship this week - Blog | OpenEnergyMonitor
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RFM69Pi v3, February 2015 Introducing RFM69Pi V3 Raspberry Pi Expansion Board - Blog | OpenEnergyMonitor
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emonPi v1, April 2015 Introducing emonPi: Raspberry Pi based energy monitor - Blog | OpenEnergyMonitor
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EmonTx3 with ESP8266 (EmonESP) 2016 ESP8266 WIFI developments - Blog | OpenEnergyMonitor
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EmonTH2 November 2016 Introducing emonTH V2 - Blog | OpenEnergyMonitor
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EmonEVSE & OpenEVSE (OpenEVSE not OEM original, EmonEVSE our pre-assembled CE approved adaptation, a lot of collaboration work by @glyn.hudson ) ~2017 OpenEVSE EV Charge Controller - Blog | OpenEnergyMonitor
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IotaWatt (resold - not OEM original) October 2017 Introducing IoTaWatt - Blog | OpenEnergyMonitor
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OVMS (resold - not OEM original) March 2020? About the OVMS category
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EmonTx4 and EmonVs available in the shop November 2022 https://community.openenergymonitor.org/t/avr-db-emontx-v4-new-hardware-in-progress/20209/198
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EmonPi2 available in the shop December 14th 2023 https://community.openenergymonitor.org/t/emonpi2-pictures-spec/24865
Future plans
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EmonTx5 and EmonPi2 CT expander board available in the shop in a few weeks time! April/May 2024 to be continued…
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EmonPi3 and EmonTx6 based on ATSamd hardware thanks to @awjlogan : 2025!