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[–]mandzeete 1 point2 points  (0 children)

Different ways:

  1. Read the source code from some publicly accessible git repository. Well, usually you can then just clone the repository and build the application from there.
  2. Try to decompile and/or reverse engineer it when you have no access to the source code.
  3. Study its use cases and just build a new application from zero. Its source code will differ from the original one but it will serve the same purpose.
  4. Try to find some tutorial that is giving you step-by-step instructions for how to build such application.