Thank you very much for replying. Besides synaptic, I found the following things that may be relevant to software/package management:

GDebi, sounds like a front end of dpkg
Software & Updates, used for configurating repositories
Software Updater, used for updating existing packages
Software Boutique, something unique to Ubuntu MATE, and I guess this is what I reminded.

Surely, it recommends non-free software like Skype, so it must be purified before use.

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