See The Future Of OCS.

Do you want to install Open Conference Systems on your server? Installing this program will allow you to host conference web sites for you and your colleagues.

System Requirements

You will need, installed on your Web server:

• PHP: >= 4.2.x (including PHP 5.x); Microsoft IIS requires PHP 5.x
  OCS 2.x currently will not run on PHP 7.x.
• MySQL: >= 3.23.23 (including MySQL 4.x) or PostgreSQL 7.1 (including PostgreSQL 8.x)
• Apache: >= 1.3.2x or >= 2.0.4x or Microsoft IIS 6
• Operating system: Any OS that supports the above software, including Linux, BSD, Solaris, Mac OS X, Windows.

As PKP does not have the resources to test every possible combination of software versions and platforms, no guarantee of correct operation or support is implied. We welcome feedback from users who have deployed OCS on systems other than those listed above.

If you do not understand these system requirements, consult your department’s technical administrator. If you are looking for OCS hosting support, PKP Publishing Services offers a full range of hosting and consultation services.

Legal Information
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free SoftwareFoundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Please read the software license for a summary of its terms and conditions. Please note that by installing and/or modifying this program, you are agreeing to the terms and conditions listed in the software license.

Contacting Us

• Support: Visit our online Bug Report System and Support Forum.
• Contact: Contact the Public Knowledge Project.

Download Instructions 

Current Stable Release (May 28, 2014)

• Download Open Conference Systems 2.3.6 (.tar.gz) (5908 KB)
  [Security issue #5871]
• Recommended patches – ocs, pkp-lib
• Upgrading from an older version to OCS 2.3.6? Please read this.
• Download patch from past OCS versions:2.3.5 2.3.4    2.3.3-1    2.3.3    2.3.2    2.3.1    2.3    2.1.2-1    2.1.2    2.1.1-2    2.1.1-1    2.1.1    2.1.0-1    2.1    2.0

Previous Releases

Note: These releases are known to contain security issues and are presented only for archival purposes.

• Download Open Conference Systems 2.3.5 (.tar.gz) (5904 KB)
• Download Open Conference Systems 2.3.4 (.tar.gz) (5164 KB)
• Download Open Conference Systems 2.3.3-1 (.tar.gz) (5164 KB)
• Download Open Conference Systems 2.3.2 (.tar.gz) (5164 KB)
• Download Open Conference Systems 2.3.1 (.tar.gz) (5164 KB)
• Download Open Conference Systems 2.3 (.tar.gz) (3216 KB)
• Download Open Conference Systems 2.1.2 (.tar.gz) (3506 KB)
• Download Open Conference Systems 2.1.1 (.tar.gz) (3216 KB)
• Download Open Conference Systems 2.1 (.tar.gz) (2968 KB)
• Download Open Conference Systems 2.0 (.tar.gz) (1512 KB)
• Download Open Conference Systems 1.1.7 (.tar.gz) (408 KB)
• OCS 1.1.6 (.tar.gz) (408 KB)
• OCS 1.1.5 (.tar.gz) (408 KB)
• OCS 1.1.4 (.tar.gz) (394 KB)
• OCS 1.1.3 (.tar.gz) (387 KB)
• OCS 1.1.2 (.tar.gz) (385 KB)
• OCS 1.1.1 (.tar.gz) (384 KB)
• OCS 1.1 (.tar.gz) (385 KB)
• OCS 1.0 (.tar.gz) (401 KB)
• OCS 1.0 (.zip) (645 KB)

For installation instructions, decompress the downloaded file and consult the README document. If you continue to have difficulty installing OCS, consult your technical administrator. The Public Knowledge Project may be able to provide further advice as required and, if circumstances require it, may be able to, at least initially, host a conference’s version of OCS.