I have two product names, say AAA and BBB. In writing, I want to start sentence with them:
The AAA and BBB are two notable products that apply this technique.
AAA and BBB are two notable products that apply this technique.
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Since they are product names (proper nouns) and you don't appear to be referring to singular instances of these, the definite article would not be used. It seems your usage is more along the lines of "BMW and Mercedes are German car manufacturers" where you are describing the companies/entities rather than "The BMW and Mercedes were parked next to each other" where the names are being used to describe specific objects.