Just for the interes, I havee placed a json file with the conten of our bug, feature and patch-tracker.
I used a slightly modified version of forgeplucker (a software that seems to be discontinued).
See: http://apt.jenslody.de/downloads/berlios.json.xz (about 2MB packed).
I create a test project in SF (
https://sourceforge.net/p/ticketexport/) , and add some tickets there, then I export them, the result json file attached. 
I compared the format of json format of berlios and SF, much similar, but we need a transfer program/script to translate the format.
a ticket of BerliOS:
{
                    "URL": "https://developer.berlios.de/bugs/?func=detailbug&bug_id=19187&group_id=5358", 
                    "assigned_to": "jenslody", 
                    "category": "Application::Crash", 
                    "class": "ARTIFACT", 
                    "comments": [
                        {
                            "class": "COMMENT", 
                            "comment": "The current SVN revision 9435 crashes when I start C::B without options and wants to send a debug log. (Which has only modules information in it.)\n\nSVN revision 9425 worked fine.\n\nWhen starting with \ncodeblocks -d -v\nit works and no longer crashes after\n\n- A message on the console:\n(codeblocks:10887): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width 18 and height -16\n\n- A popup with the text\n\"iCCP: known incorrect sRGB profile\"\n-> Details shows the same message 9 times.\n\nAfter clicking \"OK\" on the popup I can work with C::B normally.\n", 
                            "date": "2013-11-08T10:44:00Z", 
                            "submitter": {
                                "class": "IDENTITY", 
                                "nick": "yamakuzure"
                            }
                        }
                    ], 
                    "dependents": [], 
                    "group": "Platform:Linux", 
                    "history": [
                        {
                            "by": "jenslody", 
                            "class": "FIELDCHANGE", 
                            "date": "2013-11-08T21:46:00Z", 
                            "field": "assigned_to", 
                            "new": "jenslody", 
                            "old": "none"
                        }
                    ], 
                    "id": 19187, 
                    "priority": "5 - Medium", 
                    "resolution": "None", 
                    "status": "Open", 
                    "summary": "[SVN 9435] Crash without debug mode (iCCP, Gtk)", 
                    "type": "bugs"
                }, 
                
a ticket of SF:
{
  "status": "open",
  "reported_by_id": "4d215fc8b9363c7d7a0004b9",
  "related_artifacts": [],
  "attachments": [],
  "reported_by": "ollydbg",
  "description": "Report a bug.",
  "labels": [
    "CodeCompletion"
  ],
  "assigned_to": "nobody",
  "assigned_to_id": null,
  "private": false,
  "summary": "Second ticket",
  "discussion_thread": {
    "_id": "3a7bb9c2",
    "posts": [
      {
        "text": "Add comments in second ticket",
        "attachments": [],
        "author": "ollydbg",
        "timestamp": "2013-11-15 01:59:37.406000",
        "slug": "5b9c",
        "subject": "#2 Second ticket"
      }
    ],
    "discussion_id": "52857ef7b9363c0db81f5bc5",
    "subject": ""
  },
  "mod_date": "2013-11-15 01:59:37.882000",
  "votes_down": 0,
  "votes_up": 0,
  "_id": "52857fcb3e5e8370b9e983b9",
  "discussion_thread_url": "http://sourceforge.net/rest/p/ticketexport/tickets/_discuss/thread/3a7bb9c2/",
  "ticket_num": 2,
  "custom_fields": {
    "_milestone": "1.0"
  },
  "created_date": "2013-11-15 01:58:35.229000"
}
I'm using Notepad++ and JStool plugin (can be easily installed by plugin manager in Notepad++) to view the json object.
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