12 picks · data-backed ranking

Best open source apps written in C#

The best self-hosted apps written in C# are Jellyfin, Bitwarden and Duplicati. Jellyfin leads with 57,817 GitHub stars. Candidates: the 27 apps whose main GitHub language is C#.

Updated Oct 7, 2026 · data from GitHub, refreshed nightly

Rank 1:
Jellyfin
jellyfin/jellyfin
Media server for audio, video, books, comics, and photos with a sleek interface and robust transcoding capabilities. Almost all modern platforms have clients, including Roku, Android TV, iOS, and…
FeaturedMedia ServersC#Docker
Jellyfin has 57,817 GitHub stars, uses the GPL-2.0 license, ships a Docker image, is written in C# and had 2,025 commits in the last year; it replaces Plex and Spotify.
Rank 2:
Bitwarden
bitwarden/server
Password manager with a webapp, browser extension, and mobile app.
Password ManagersC#Docker
Bitwarden has 20,244 GitHub stars, uses the AGPL-3.0 license, ships a Docker image, is written in C# and had 1,544 commits in the last year; it replaces Bitwarden and 1Password.
Rank 3:
Duplicati
duplicati/duplicati
Free backup software that stores encrypted, incremental backups on cloud storage and servers.
BackupC#Docker
Duplicati has 15,062 GitHub stars, uses the MIT license, ships a Docker image, is written in C# and had 2,440 commits in the last year.

Full ranking

All 12 picks, ranked

Ranked by GitHub stars and recent activity. Open any pick for live stats and licence details.

1
JellyfinFeatured
Media server for audio, video, books, comics, and photos with a sleek interface and robust transcoding capabilities. Almost all modern platforms have clients, including Roku, Android TV, iOS, and…
Media ServersDocker
Jellyfin has 57,817 GitHub stars, uses the GPL-2.0 license, ships a Docker image, is written in C# and had 2,025 commits in the last year; it replaces Plex and Spotify.
2
Bitwarden
Password manager with a webapp, browser extension, and mobile app.
Password ManagersDocker
Bitwarden has 20,244 GitHub stars, uses the AGPL-3.0 license, ships a Docker image, is written in C# and had 1,544 commits in the last year; it replaces Bitwarden and 1Password.
3
Duplicati
Free backup software that stores encrypted, incremental backups on cloud storage and servers.
BackupDocker
Duplicati has 15,062 GitHub stars, uses the MIT license, ships a Docker image, is written in C# and had 2,440 commits in the last year.
4
Sonarr
Automatic TV Shows downloader and manager for Usenet and BitTorrent. It can grab, sort and rename new episodes and automatically upgrade the quality of files already downloaded when a better quality…
Media ManagementDocker
Sonarr has 16,826 GitHub stars, uses the GPL-3.0 license, ships a Docker image, is written in C# and had 610 commits in the last year.
5
Technitium DNS Server
Authoritative/recursive DNS server with ad blocking functionality.
Network Utilities & DNSDocker
Technitium DNS Server has 10,065 GitHub stars, uses the GPL-3.0 license, ships a Docker image, is written in C# and had 689 commits in the last year.
6
Kavita
Cross-platform e-book/manga/comic/pdf server and web reader with user management, ratings and reviews, and metadata support.
E-booksDocker
Kavita has 11,806 GitHub stars, uses the GPL-3.0 license, ships a Docker image, is written in C# and had 368 commits in the last year; it replaces Kindle and Audible.
7
Radarr
Automatically download movies via Usenet and BitTorrent (fork of Sonarr).
Media ManagementDocker
Radarr has 14,506 GitHub stars, uses the GPL-3.0 license, ships a Docker image, is written in C# and had 116 commits in the last year.
8
slskd
A modern client-server application for the Soulseek file sharing network.
File SharingDocker
slskd has 4,010 GitHub stars, uses the AGPL-3.0 license, ships a Docker image, is written in C# and had 1,056 commits in the last year.
9
BTCPay Server
Bitcoin and other cryptocurrencies payment processor.
Finance & Budgeting
BTCPay Server has 7,786 GitHub stars, uses the MIT license, is written in C# and had 707 commits in the last year.
10
Prowlarr
Indexer manager and proxy that integrates with Sonarr, Radarr and Lidarr.
Media ManagementDocker
Prowlarr has 7,330 GitHub stars, uses the GPL-3.0 license, ships a Docker image, is written in C# and had 147 commits in the last year.
11
Umbraco
The friendly CMS. Free and open source with an amazing community.
CMS
Umbraco has 5,262 GitHub stars, uses the MIT license, is written in C# and had 2,598 commits in the last year.
12
Ombi
Content request system for Plex/Emby, connects to SickRage, CouchPotato, Sonarr, with a growing feature set.
Media ManagementDocker
Ombi has 4,105 GitHub stars, uses the GPL-2.0 license, ships a Docker image, is written in C# and had 351 commits in the last year.

FAQ

Questions and answers

Still curious? Email info@appsgit.com.

What are the best self-hosted apps written in C#?

The best self-hosted apps written in C# are Jellyfin, Bitwarden and Duplicati. Jellyfin leads with 57,817 GitHub stars. Candidates: the 27 apps whose main GitHub language is C#.

Is Jellyfin free?

Yes. Jellyfin is open-source software released under the GPL-2.0 license, so you can self-host it at no cost. You only pay for the server it runs on, and some projects also offer an optional paid cloud plan.

Can I self-host these apps with Docker?

Yes, 10 of the 12 picks. Jellyfin, Bitwarden and Duplicati publish Docker images, so you can run them on a VPS or home server with Docker Compose. The others install from their own packages or source; follow each project's install guide.

Are all of these apps open source?

All 12 apps on this list are open source. You can self-host and modify each one under its license.

Which of these apps is the most actively developed?

Umbraco, with 2,598 commits in the last 12 months and a latest release, release-18.2.1, from October 2026. Activity is a good sign that bugs and security issues get fixed.

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Best open source apps written in C#

Top picks

Jellyfin

Bitwarden

Duplicati