Commercial, paid: You must pay money, you get access to service or a binary, or something in between. No source code released.

Shareware: You get to download and use the binary for free. Parts of it are missing, you must pay to receive a copy of it. (DOOM, WinRAR, Duke Nukem)

Freeware: Binaries are free to use and distribute, complete functionality. Source code not published. (Adobe Acrobat Reader, Draw.io, IrfanView, Google Earth Pro)

Open-source: The source code is openly available. Sometimes development also happens in the open. (PHP, Apache HTTPD, Linux, GCC)

Open weights: AI model weights released including inference, tokenizer code and chat template. Some info released about how it was made. Training dataset and taining code NOT published. Crawler, scraper, book piracy, distillation methods: NOT published.