Roundcube

Facts

License GNU General Public License v3.0 Permissions of this strong copyleft license are conditioned on making available complete source code of licensed works and modifications, which include larger works using a licensed work, under the same license. Copyright and license notices must be preserved. Contributors provide an express grant of patent rights. May Commercial useModificationDistributionPatent usePrivate use Must License and copyright noticeState changesDisclose sourceSame license No LiabilityWarranty Summary from GitHub's choosealicense.com

Paid-feature tier A Tier ANo paid feature gates in the self-run edition

Self-host Self-hostable: yesYou can run it on your own server.

Paid-feature limitsNone established

Tier A: Identified edition is core Roundcube webmail: GPLv3-or-later with custom skins/plugins exception, freely deployable and listing unlimited users/messages. The exception permits separately licensed commercial plugins; such plugins are not represented as included. Nextcloud sells enterprise support/SLA and optional separate server bundles; no core webmail feature paywall identified. Hosted availability refers to independent providers listed by the project, not a first-party Roundcube SaaS. License source. Repository: roundcube/roundcubemail. Self-host: server; hosted offer from the project: no.