Manga

Mango-dl - An easy-to-use cli tool for downloading manga.
Simple-manga-downloader - Simple manga downloader written in python.
Mangadl-bash - Search and batch download mangas straight in terminal.
Manga2mobi - Download manga/comic and convert it to mobi file for Kindle.
Mangapy - Manga Downloader.
ScrapScan - Python script to scrap Manga scans online and convert them as PDF.
Mdownloader - MangaDex downloader using python. Forked from the repo linked.
Manga-py - Universal manga downloader.
Nice-pferd - Manga scans reader and downloader for when you get offline.
Furb - Manga Chapter Downloader.
Manga-Chapter - FoOlSlide downloader.
Mangadesk - Terminal client for MangaDex 📖.
MangaReaderScraper - Search and download mangas from the command line.
Mango - Mango is a self-hosted manga server and web reader.
FMD2 - This is an active fork of the Free Manga Downloader which is a free open source application written in Object Pascal for managing and downloading manga from various websites.
Mass-Manga-Downloader - Download Mangas From websites.
Manga-cli - Script to read manga from cli.
7USTIN/manga-cli - 📖 Bash script for reading mangas via the terminal.

Comics

AutoBook - Comics download script.
Comics-Downloader - Tool to download comics and manga in pdf/epub/cbr/cbz from a website.
ComicMaker - ComicMaker is a command line tool to download Comics and Manga from various Manga and Comic sites easily.
Comic-dl - Comic-dl is a command line tool to download manga and comics from various comic and manga sites.
Webcomix - Webcomic downloader.
Comics-dl - Comics Archiver.
Tapas-Comic-Downloader - This is a downloader to download whole comics from https://tapas.io/.
Comic2pdf - Comic2pdf converts comic book format to pdf.

Novel-Grabber - Novel-Grabber can download novels from pretty much any webnovel and lightnovel site.
LightNovel-Crawler - Download and generate e-books from online sources.
Novel-2-EBook - Python program to download novels available on Wuxia World and other sites as E-Books.
Mknovel - Download web novel and pack.

Adolla - Manga reader for every device with a web browser.
Komga - Media server for comics/mangas/BDs with API and OPDS support.
Kavita - Kavita is a fast, feature rich, cross platform reading server.
Ame-Reader - In-browser manga & comic reader.
Kthoom - Comic Book Reader in the Browser.
Mangareader - Qt manga reader for local files.
OpenComic - Comic and Manga reader, written with Node.js and using Electron.
Iizume-mobile - free and open source mobile application for browsing and reading manga.
FoOlSlideX - The new, most powerful Comic- & Manga-Reader ever created by the human race.
Mango - Mango is a self-hosted manga server and web reader.
Calibre-web - 📚 Web app for browsing, reading and downloading eBooks stored in a Calibre database.
LANraragi - Web application for archival and reading of manga/doujinshi. Lightweight and Docker-ready for NAS/servers.
Tanoshi - Selfhosted web manga reader with extensions.
Villain - A free and open source web-based comic book reader.
Ubooquity - Read your ebooks and comics on your favorite device, wherever you go.