Notepad++ https://notepad-plus-plus.org/downloads/
FFmpeg https://www.ffmpeg.org/
In general, writing custom batch scripts to use with a handful of cli tools (Curl, PhantomJS, FFMpeg etc) will get a lot things done. No need to install a different tool for every different task.
Plus Adobe Photoshop and Premiere. But as mentioned, there are good replacements for that, like Gimp or Davinci Resolve (both free).