Redmine

This would be a very good option, and to be able to export the
results into csv, pdf

This is a VERY important feature for our team, too.

Very important to our company also. We have hacked a way to do it so when your on the "My page" page it will act as a global search, but it doesn't work all the time and it sucks to have to go back to "My page" to search globally

+1 for this feature.

Would be good if global search options were just like project search options.

I would like to add my support to this feature. As we add more project the information that might be useful to a user may be stored in different locations. The ability to search without having to know each project within redmine would be a very positive addition.

+1, too. Searching all wikis would save me a lot of time.

Patched in #821.

Just a question regarding this (really usefull!) feature: will everybody be able to search in all wiki pages or is there going to be the possibility to restrict the access to some pages/wikis?

In patch #821, the search all projects will only search through public projects and projects that are visible to the user (if they are logged in). Jean-Philippe may do it differently than my patch, but I imagine it would have the same restriction.