GIMP (http://www.gimp.org/) is my go-to app for image manipulation. A lot of the features of pricier packages, but it’s free and has been more many, many years.

I use Audacity for audio recording. I’m not very experienced, but it was pretty easy. I used it to record my audio books and also trim MP3 to ringtone size (PAY for a ringtone when I own a legal copy of the song? Nah.)