Issue Management Tools

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Category	Project Planning (16) Issue ManagementXexclude from selection Project Collaboration (10)
License	Open Source (4) Commercial (16) Web-based service (SaaS) (14)
Programming language	C# (1) Java (3) PHP (2) TCL (1)
Operating systems	AIX (2) FreeBSD (1) HP-UX (1) Linux (6) NetBSD (1) OS X (4) Solaris (2) Unix (3) Windows (16)
Mobile apps	Android (3) iOS (3)
Authentication mechanism	Password (18) LDAP (9) SAML (2) NTLM (3) CAS (1) IMAP (1) HTTP authentication (2) Active DirectoryXexclude from selection Facebook sign-on (2) Google sign-on (2) Microsoft sign-on (2) Twitter sign-on (1) Yahoo sign-on (1) OneLogin (2)
Notifications	Desktop push (1) Email (19) RSS feeds (5)
Features	Web-based architecture (19) API (14) Multi-user (19) User roles (19) Hierarchical issues (8) Custom fields (18) Custom workflows (17)

19 project management systems with the selected characteristics.
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