Issue Management Tools

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Category	Project Planning (15) Issue ManagementXexclude from selection Project Collaboration (12)
License	Open Source (6) Commercial (9) Web-based service (SaaS) (16)
Programming language	Java (3) PHP (4) Python (1) Ruby (3)
Operating systems	FreeBSD (2) Linux (9) NetBSD (1) OS X (8) Solaris (1) Unix (3) Windows (13)
Mobile apps	Android (5) iOS (6) Windows Phone (2)
Authentication mechanism	Password (22) LDAP (6) OpenID (2) SAML (2) NTLM (1) HTTP authentication (1) Active Directory (5) Facebook sign-on (2) Google sign-on (3) LinkedIn sign-on (1) Microsoft sign-on (1) Twitter sign-on (1) Xing sign-on (1) Yahoo sign-on (1)
Notifications	Desktop push (2) Email (22) Instant messaging (1) RSS feedsXexclude from selection SMS (1)
Features	Web-based architecture (22) API (15) Multi-user (22) User roles (18) Hierarchical issues (8) Custom fields (15) Custom workflows (12)

22 project management systems with the selected characteristics.
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