Gitlab vs Redmine


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Gitlab
GitLab offers git repository management, code reviews, issue tracking, activity feeds and wiki’s. Enterprises install GitLab on-premise and connect it with LDAP and Active Directory servers for secure authentication and authorization. A single GitLab server can handle more than 25,000 users but it is also possible to create a high availability setup with a multiple active servers.
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Redmine
Redmine is a flexible alternative project management web application. Written using the Ruby on Rails framework, it is cross-platform and cross-database. Redmine is open source and released under the terms of the GNU General Public License v2 (GPL).
Face to face in the news:


2014 - Redmine 2.5 impoves custom fields. Gitlab should better react

Redmine is a flexible project management web application written using Ruby on Rails framework. The new version - Redmine 2.5.0 is available for download. It brings many improvements to custom fields formats: text formatting support, HTTP link support, fine-grained selection for user and version custom fields based on roles and version status. The custom field format API was fully rewritten, so if you're running some plugins that deal with it (eg. that adds non standard field formats), you'll have to update them before upgrading. This version also introduces experimental support for Markdown formatting, a popular text formatting syntax.