Eosdis Worldview
worldview.earthdata.nasa.gov
worldview.earthdata.nasa.gov
It was actually pretty interesting hearing about programming from the perspective of researchers. They run into many of the classic problems that beginner programmers face but as a culture they don't have the tools to solve them (like for example, they need version control but no one has heard of git).
Both Worldview and GIBS are open source. [3] [4]
Finally, if you're interested in this, also check out https://search.earthdata.nasa.gov, which is a search client on top of NASA's metadata holdings index (CMR). It's not quite as beginner friendly -- it expects that you're somewhat familiar with remote sensing products and geospatial searching -- but it's a good front end into EOSDIS' data.
[1] https://earthdata.nasa.gov/about/science-system-description/...
[2] https://wiki.earthdata.nasa.gov/display/GIBS/GIBS+API+for+De...