The $5 Raspberry Pi Zero is the low-end board but suitable for basic applications. Pi Zero 1.3 supports to access cameras and allows makers to have various applications.
Getting Started with the Raspberry Pi Zero Wireless - SparkFun Learn
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10 Years of Raspberry Pi - History of Raspberry Pi and element14 Community - element14 Community
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The Different Versions of the Raspberry Pi - Pi My Life Up
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Fresh From the Oven: Pi for Your Desktop - IEEE Spectrum
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Radxa Zero 3 (E/W) - Zero Series - Radxa Forum
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Orange Pi Zero 2W is a Raspberry Pi Zero lookalike with Allwinner H618 and up to 4GB RAM - Liliputing