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FLStudio is a Digital Audio Workstation (DAW) that can be used to make music.
Davinci Resolve is a video editor with a ton of features. Some features are locked behind a paywall, but 90% of the basic stuff you'll actually use is included in the free version.
Paint.NET is a free photo editing program. It has most of the essential features you'll need in a photo editor.
Although most known for being an email client, Thunderbird also functions as a RSS Reader and an IRC client.
GIMP is an open source photo editor. I don't really use this much except for stuff that Paint.NET can't do.