Volute was a subversion repository for developing VO standards and ancillary artefacts. We still let it run for the historical record, but actual VO standard development is currently taking place within the ivoa-std organisation on github.com.
To browse the repository, point your browser at the repository itself (interesting stuff starts at trunk/projects).
Volute used to be on Google Code before it shut down. If you have checkouts from the old google code repository, just run
svn relocate https://volute.googlecode.com https://volute.g-vo.org svn update
within them. Converting volute URLs out there is similarly straightforward. Of course, this only ought to be necessary if you want to push tombstones here; otherwise, you should be on youknowwhere.
For authoring IVOA standards, there is a TeX-based document authoring system called iovaTeX, and you are encouraged to use it together with Volute. See http://ivoatex.g-vo.org for details.