All SaaS

Calibre Web

github.com

Open source

Browse, read and download eBooks using an existing Calibre database.

Calibre Web Automated

github.com

Open source

All-in-one solution, combining the modern lightweight web UI from Calibre-Web with the robust, versatile feature set of Calibre (fork of Calibre Web).

Cannery

cannery.app

Open source

Firearm and ammunition tracker app.

Canvas LMS

instructure.com

Open source

Learning management system (LMS) that is revolutionizing the way we educate.

CapRover

caprover.com

Open source

Open-source alternative to Heroku.

Castopod

castopod.org

Open source

Podcast management hosting platform that includes the latest podcast 2.0 standards, an automated Fediverse feed, analytics, an embeddable player, and more.

Centrifugo

centrifugal.dev

Open source

Language-agnostic real-time messaging (Websocket or SockJS) server.

Chamilo LMS

chamilo.org

Open source

Create a virtual campus for the provision of online or semi-online training.

changedetection.io

changedetection.io

Open source

Stay up-to-date with web-site content changes.

ChannelTube

github.com

Open source

- Download video or audio from YouTube channels on a schedule via yt-dlp.

Chartbrew

chartbrew.com

Open source

Connect directly to databases and APIs and use the data to create beautiful charts.

ChartDB

chartdb.io

Open source

Database diagrams editor that allows you to visualize and design your DB with a single query.

chasquid

blitiri.com.ar

Open source

SMTP (email) server with a focus on simplicity, security, and ease of operation.

ChatRWKV

twitter.com

Open source

Open-source alternative to ChatGPT.

Chatwoot

chatwoot.com

Open source

Open-source alternative to Intercom.

Chibisafe

chibisafe.app

Open source

File uploader service that aims to to be easy to use and set up. It accepts files, photos, documents, anything you imagine and gives you back a shareable link for you to send to others.

ChiefOnboarding

chiefonboarding.com

Open source

Employee onboarding platform that allows you to provision user accounts and create sequences with todo items, resources, text/email/Slack messages, and more! Available as a web portal and Slack bot.

Chirpy

chirpy.dev

Open source

Privacy-friendly and customizable Disqus (comment system) alternate.

Chitchatter

chitchatter.im

Open source

Peer-to-peer chat app that is serverless, decentralized, and ephemeral.

Chyrp Lite

chyrplite.net

Open source

Extra-awesome, extra-lightweight blog engine.

Citadel

citadel.org

Open source

Groupware including email, calendar/scheduling, address books, forums, mailing lists, IM, wiki and blog engines, RSS aggregation and more.

CKAN

ckan.org

Open source

Make open data websites.

ClipBucket

clipbucket.fr

Open source

Start your own video sharing website (YouTube/Netflix Clone) in a matter of minutes.

ClipCascade

github.com

Open source

Syncs your clipboard across multiple devices instantly, without any button press. Available on Windows, macOS, Linux, and Android, it provides seamless and secure clipboard sharing with end-to-end data encryption.