So, you have seen some interesting new feature in the monthly development update, and you want to try it out. Maybe you want to check exactly how a particular change was implemented. Or maybe you would like to produce a patch which depends on some changes being made in the development version.
Zabbix stores all its source code in a code repository, namely a Subversion one. As an open source project, it also provides access to this repository to everybody, so it is possible to take a look at how a development version is shaping up. In general, there are many possibilities—not unique to Zabbix, but possible because of the open source approach that open this way. Some might be: