I am not a specialist in the field, but projects that could be sold as apps may embrace a range of games up to practical and productive app with which people can do things. The best ideas might be:
1- games (that uses mobilephone sensors for controling)
2- practical apps (these days cloud storage is a hot debate, apps that can connect different cloud storage without complexity for setting them up)
3- productive (specialized apps that use AI to produce music, long and short stories or theatre and film scripts, so on)
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