The only project I know that is viable is rolopress, download it and see what you can adjust.
FYI I have a related question open here: https://webapps.stackexchange.com/questions/9530/does-a-free-personal-relationship-system-exist-out-there/9545#9545 but for a PRM.
But the thing you are looking for is I think not a CRM system but a PM/software project system, all your requirements are met with RTC ( http://www.jazz.net ), free for 10 users. It has chat, users, projects, projectmanagement, tickets, version control, reports, your (agile/RUP/UP/whatever) planning and project approach etc… and all integrated. You can have rss feeds on everything and it has a REST, etc.. possibilites and an API. I have not tried version 3 yet: http://jazz.net/blog/index.php/2010/11/23/rational-team-concert-3-0-released/
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