The tech sector is known for generating millionaire-making gains for patient investors. However, the world's top tech stocks -- like Nvidia, , and Apple -- are already worth trillions of dollars and probably have less upside potential than the sector's smaller and lesser-known stocks.

So today, I'll focus on three underappreciated small- and mid-cap stocks that could potentially deliver millionaire-making gains over the next few decades: Reddit (NYSE: RDDT), Fiverr International (NYSE: FVRR), and DigitalOcean (NYSE: DOCN).

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Source Fool.com