Based on our record, esp32 should be more popular than Odroid. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
If you are not so concerned about the pinouts, the ODROIDs are excellent and generally in stock if you buy them from hardkernel.com. They are similar prices but a bit more powerful, although some (such as the M1) are quite big. I ended up buying some ODROIDs as alternatives and they worked out ok where I didn't need a Pi camera or hat. In the future I'll probably move more towards ODROIDs because of the power and... Source: over 1 year ago
Esp32.net has a bunch of additional references, projects, and places to gather information. Source: almost 3 years ago
Closest thing is the ESP32 from Espressif Systems See ESP32 link for details. Since you specifically asked for open source, so some tinkering and compile is required. Source: almost 3 years ago
There's also many more dev boards, chips and modules listed here, though they may not necessarily have platformio IDs. Source: about 3 years ago
Raspberry Pi - The Raspberry Pi is a tiny and affordable computer that you can use to learn programming through fun, practical projects. Join the global Raspberry Pi community.
Intel NUC boards - Four-by-four inch Intel NUC boards come with a soldered-on processor.
Orange Pi - It’s an open-source single-board computer. It can run Android 4.
Intel NUC - Intel NUCs are available as Kits(Barebones), Boards(Mainbaord only) and as perconfigured Mini-PCs.
OLinuXino - Open Source Software and Open Source Hardware, low cost Linux Industrial grade single board...
ESPRESSObin - Electronics, Single Board Computer, and x86