Atlassian Confluence（简称Confluence）是一个专业的wiki程序。它是一个知识管理的工具，通过它可以实现团队成员之间的协作和知识共享。

Confluence使用简单，但它强大的编辑和站点管理特征能够帮助团队成员之间共享信息，文档协作，集体讨论。目前，Confluence被用于广泛地用于项目团队，开发团队，市场销售团队。

中文演示站点 http://www.fangwai.net:8080/confluence/dashboard.action

JIRA:一个优秀的缺陷跟踪与项目管理软件

缺陷跟踪，或称为：Bug Tracking, Defect Tracking，是产品开发(尤其是软件开发)和维护过程中重要的辅助工具，用于跟踪记录产品的缺陷、需求变更等，作为沟通开发人员与测试人员、客户的沟通的桥梁，保障产品开发流程更加协调。

都是商业软件，但很好的一点是可以允许开源项目/非赢利组织获得免费许可。某网站上是这么说的：

非盈利机构：非赢利性的非官方/学术/商业/政治/恶搞性组织，可以尝试申请免费使用
开源组织：正在进行开源项目开发的组织可以尝试申请
个人试用：你可以在进行Confluence永久试用。（此版本限制wiki上最多注册两个用户）

其官方网站上是这么说的：

Community & Open Source Licenses
Community
Confluence is free for use by official non-profit organisations and charities (proof of non-profit status is required). There are certain organisations whose purpose is to make the world a better place, and we believe in helping them achieve that.

Community licenses are designed for organisations which are:

non-profit,
non-government,
non-academic,
non-commercial,
non-political and
secular
in nature, that would not otherwise be able to afford Confluence. If your organisation is philanthropic in nature then you probably qualify.

Apply for a Community License online 
Open Source
Atlassian supports and believes in the Open Source movement - Confluence utilises a number of good Open Source components, and Atlassian developers are committers on a large number of Open Source projects.

To give back to the open source community (and hopefully improve the quality of those projects!), Confluence is free for any Open Source project to use.

There are a few requirements for an Open Source license, the main ones being:

Established code base
Publicly available project website
Using an approved open source license
Your Confluence instance will be publicly accessible