CDisplay Ex - CDisplay Ex is the most used comic book reader.
NeoDownloader - As you know, there is a lot of websites with a lot of pictures, music and movies.
YACReader - Download YACReader for your platform. Windows, Linux, MacOSX. And enjoy you comic books cbr cbz with the best comic reader.
Vov Picture Downloader - Download pictures from websites.
Tachiyomi - A free and open source manga reader for Android.
Persepolis Download Manager - Persepolis Download Manager is a GUI for aria2.