Here are some examples:

* Plants: Plants use photosynthesis to convert sunlight, water, and carbon dioxide into glucose (sugar) for energy.

* Algae: These are single-celled or multicellular organisms that also use photosynthesis.

* Some bacteria: Certain types of bacteria can produce energy through chemosynthesis, a process that uses chemicals instead of sunlight.

Let me know if you'd like to know more about autotrophs!