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Nick Holonyak Jr. created the prototype of LED lights. Even though they didn't work great (they emitted red light and weren't super bright) they set the stage for the LED lights we use today.
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Douglas Engelbart invented the first computer mouse with wood and two gear wheels. This has evolved into the computer mouses we use today.
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Although RAM was already in existence, Robert Dennard improved it by making it smaller and more efficient.
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Ralph Baer invented the Brown Box, which was the first video game console! This prototype set the stage for the video game consoles we play on today.
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The UNIX machine was a powerful operating system created by various people who worked for AT&T. It enabled the organization of files into a hierarchy, which is something modern-day computers still do.