Natural Docs
Natural Docs is an open source documentation generator for multiple programming languages. You document your code in a natural syntax that reads like plain English. Natural Docs then scans your code and builds high-quality HTML documentation from it.
More information is available on NaturalDocs.org, including:
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Natural Docs is licensed under the GNU Affero General Public License, version 3. See Engine\Resources\License\License.txt for full details and incorporated code.