Your own project

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Pro: You can decide on everything:

• programming language
• technology stack
• architecture
• code layout
• testing

Contra: You have to do everything yourself.

• programming
• documentation
• examples
• design
• logo
• web site for the project

• No users.
• No cooperation from others (at least at the beginning).
• No community.

Advice:

• Something like that probably already exists. Maybe better finding it and contributing to that project.
• Take an existing proprietary product and implement an open source alternative