Based on our record, esp32 should be more popular than Nest Hello. 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.
Nest doorbell camera. I'd put up a couple of their outdoor cameras as well. So much as a cat walks by it will record it. Source: about 3 years 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
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ESPRESSObin - Electronics, Single Board Computer, and x86