Free and open-source file hosting software suite
Nextcloud is a suite of client-server software for creating and using file hosting services. Nextcloud provides functionality similar to Dropbox, Office 365, or Google Drive when used with integrated office suites Collabora Online or OnlyOffice. It can be hosted in the cloud or on-premises. It is scalable, from home office software based on the low cost Raspberry Pi, all the way through to full sized data centers that support millions of users. Translations in 60 languages exist for web interface and client applications.
Features.
Nextcloud files are stored in conventional directory structures, accessible via WebDAV if necessary. A SQLite, MySQL/MariaDB or PostgreSQL database is required to provide additional functionality like permissions, shares, and comments.
Nextcloud can synchronize with local clients running Windows (Windows 8.1 and above), macOS (10.14 or later), Linux and FreeBSD. Nextcloud permits user and group administration locally or via different Backends like OpenID or LDAP. Content can be shared inside the system by defining granular read/write permissions between users and groups. Nextcloud users can create public URLs when sharing files.
Logging of file-related actions, as well as disallowing access based on file access rules is also available.
Security options like multi-factor authentication using TOTP, WebAuthn, Oauth2, OpenID Connect, Brute-force protection exist.
Nextcloud has planned new features such as monitoring capabilities, full-text search and Kerberos authentication, as well as audio/video conferencing, expanded federation and smaller user interface improvements.
Integrations and devices.
Multiple vendors and independent projects develop integrations and devices with Nextcloud focusing on different aspects like improved security or simplified administration.
NextcloudPi.
Initially started to run Nextcloud on a RaspberryPi, NextcloudPi turned into a ready to use image for Virtual Machines, Raspberry Pi, Odroid HC1, Rock64 and other boards. 
Nextcloud Box (discontinued).
In September 2016, Nextcloud, in cooperation with Western Digital Labs and Canonical (the company behind Ubuntu), released the Nextcloud Box. The Nextcloud box was based on a Raspberry Pi, running Ubuntu Core with Snappy; it was intended to serve as a reference device for other vendors. In June 2017, Western Digital shut down Western Digital Labs, which caused the production of the box to end.
History.
In April 2016 Frank Karlitschek and most core contributors left ownCloud Inc. These included some of ownCloud's staff according to sources near to the ownCloud community. Karlitschek and many of these contributors went on to fork the ownCloud, creating NextCloud.
The fork was preceded by a blog post of Karlitschek announcing his departure and raising questions about the management of the ownCloud, its community, and priorities between growth, money, and sustainability. There have been no official statements about the reason for the fork. However, Karlitschek mentioned the fork several times in a talk at the 2018 FOSDEM conference and in two appearances on the FLOSS Weekly podcast, emphasizing cultural mismatch between open source developers and business oriented people not used to the open source community.
On June 2, within 12 hours of the announcement of the fork, the American entity "ownCloud Inc." announced that it is shutting down with immediate effect, stating that "[...] main lenders in the US have cancelled our credit. Following American law, we are forced to close the doors of ownCloud, Inc. with immediate effect and terminate the contracts of 8 employees." ownCloud Inc. accused Karlitschek of poaching developers, while Nextcloud developers such as Arthur Schiwon stated that he "decided to quit because not everything in the ownCloud Inc. company world evolved as I imagined". ownCloud GmbH continued operations, secured financing from new investors and took over the business of ownCloud Inc.
In April 2018 () reported Nextcloud wins the tender for " (Germany government cloud) project.
In August 2019 it was announced that the governments of France, Sweden and the Netherlands will use Nextcloud for file transfer.
In January 2020 Nextcloud 18 "Nextcloud Hub"" was released. The major change was direct integration of an Office suite (OnlyOffice) and Nextcloud claimed the goal to compete with Office 365 and Google Docs. Partnership with Ionos was revealed - its hosting location in Germany and compliance with GDPR should support the goal of data sovereignty.
In spring 2020 remote work and web conferencing usage raised due to COVID-19 pandemic and Nextcloud released version 19 with chat and videoconferencing "Talk app" integrated into the application core. Talk with an optional "high performance back-end" allows self-hosting of web conferences with more than 10 participants. Collabora Online was introduced as another integrated office suite.
In August 2021 Nextcloud was chosen as collaboration platform for European cloud software GAIA-X.
In September 2021 Nextcloud was mentioned as "success case" and "most widely deployed Open Source content collaboration platform" in an "Open Source Study" of the European Commission.
25 April to 10 May 2022 "Open Source Programme Office" at the European Commission organizes NextGov Hackathon and awards up to 5000 EUR for improvements to Nextcloud apps and security.
References.
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