Fast, modern and advanced photo management suite. Runs as a Nextcloud app. ([Demo](https://demo.memories.gallery/apps/memories/), [Source Code](https://github.com/pulsejet/memories)) `AGPL-3.0` `PHP`
memories.gallery
Alternatives to
Citadel
Best alternatives to Citadel in 2026
Citadel is "Groupware including email, calendar/scheduling, address books, forums, mailing lists, IM, wiki and blog engines, RSS aggregation and more. ([Source Code](https://www.citadel.org/source.html)) `GPL-3.0` `C/Docker/Shell`". If you are looking for an alternative to Citadel in 2026 — whether for pricing, features or compatibility reasons — mySelectas has curated the 5 best options available. The most popular alternatives include: Nextcloud, Zimbra. All these solutions are listed in the Informatique category.
Quick comparison of Citadel alternatives
| # | Tool | Best for | Price |
|---|---|---|---|
| 1 | Grand public | — | |
| 2 | Entreprises | — | |
| 3 | Grand public | — | |
| 4 | Développeurs | — | |
| 5 | Grand public | — |
#1
FAQ about Citadel alternatives
- What is the best alternative to Citadel in 2026?
- Based on our selection, Nextcloud Memories is the best alternative to Citadel in 2026. Fast, modern and advanced photo management suite. Runs as a Nextcloud app. ([Demo](https://demo.memories.gallery/apps/memories/), [Source Code](https://github.com/pulsejet/memories)) `AGPL-3.0` `PHP`. See our full ranking above to compare all options.
- Is Citadel free?
- Citadel is a paid tool. Several alternatives in our selection offer free or freemium versions.
- How many alternatives to Citadel are there?
- mySelectas has listed 5 alternatives to Citadel in the Informatique category. Our selection is updated regularly to include the best options available.