I recently rewrote my Julia set grapher from C to JavaScript so I could have a more interactive version of the program, with which I could play on the go and showcase it online. You can find the online version here, if you wish to try it out.

If you want to have the console app written in C which outputs bigger pictures of higher quality, get the source code from GitHub and build it yourself.

Source code for the JavaScript version is on both: GitLab and GitHub.