A Tagging system would be a great feature for redmine.

Two tagging versions could be possible:

The user gets a textfield and enters tags (separated by space - linked words are encapsulated in quotes - eg. "tag this string" term2 term3 "term nr 4")

Central tagging handling: The system admin generates a list of tags (similar to the 'user defined fields' - taggroups can be assinged to different pageareas )
The user then gets the opportunity to check a variable number of tags (within an issue or a project or [most imortant] while booking time)

While beeing a good typo3 and JS programmer, my Ruby on Rails skills are pathetic. Therefore I can just offer my help for testing and conceptualization!

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Maybe you can look at the tagging plugin for trac:
http://trac-hacks.org/wiki/TagsPlugin

It implements a tag cloud of all tags which are entered at the wiki page and tickets...
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I Tried Installing that.But it asks me for Proxy Authentication.Are u using that Tags Plugin of TRAC.if so can u tell me how u installed that one.How the Trac plugin will communicate with redmine
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Sorry for misunderstanding me.
This is a plugin for TRAC, not for Redmine. It can only give you ideas how to implement it.
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This is related to #480 - "Wiki: Support categories tagging and autolisting" and the more general issue #1448 - "Add tags to issues".

Personally tagging would be good for the wiki as pages don't always fit into a neat category so being able to add tags is one step better than just relying on the good search facilities in Redmine.
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I would love to see tagging support added to redmine by default as well. This plugin is available and looks like a good start, although I was unable to install it in our production environment,

http://github.com/friflaj/redmine_tagging#readme

Unfortunately that plugin only seems to tag on issues (not documents, files, wiki pages, etc). It seems that the author of this plugin is actively working on it, perhaps he could be convinced to add tagging to the redmine codebase proper.

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+1
I'd love to see tagging in Redmine's near future, too!

May I add a requirement here: In my Use Case _some_ tags should be protected from being deleted by users with insufficient rights. It could be solved with something like:
A tag added to an issue by an administrator may not be deleted by a non-admin.
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Not sure how I missed this when I created my issue, but +1 for sure.
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To have built-in tagging would be awesome!

p.s. About GUI: I like how Tags look like in "Redmine contacts plugin":http://redminecrm.com/projects/contacts-plugin/contacts
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Another feature which MUST BE INCLUDED!!!

I tried installing the plugin from http://github.com/friflaj/redmine_tagging#readme

but unfortunately it breaks other plugins compatability such as show attachments as thumbnails
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https://github.com/ixti/redmine_tags
works in Redmine 2.x.x
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I really think tagging needs to be integrated into Redmine core. In a world where many projects are turned around in a short amount of time, in an increasingly unstructured way, tagging is starting to make more sense than carefully pre-arranged categories and fields. Look at Github, for instance. I think this needs to be merged, and should receive some more focus to integrate it throughout Redmine.
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+1000 quite important to have this feature!
Multiple and Transverse possibility!
please
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+1
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don't think it would be implemented anytime soon .. check the date when it was created ... :(
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Also, https://github.com/ixti/redmine_tags stagnates -- 19 open issues
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Ivan Cenov wrote:
> Also, https://github.com/ixti/redmine_tags stagnates -- 19 open issues

Yeah.. Anybody knows a working implementation for the latest redmine version?
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+1

This feature is badly needed. Redmine is spectacular - the devs did a bang-up job - but this is a standard issue-tracker feature and its absence is a gaping hole.
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+1 this is needed on larger projects where issue should be added to multiple categories.
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+1
Really hope to have this feature to organize our issues.
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+1 Really need it as native feature
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+1
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+1
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+1
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Completely Agree that a tags system is desperately needed in Redmine.
Redmine is indeed a powerful and happy ting to use, tags would make it simply awesome.
I guess, stackoverflow style tagging, issue tracking, and wiki composing would be incredible.
It could make the very process and experience of Redmine usage - Agile, simple and self-intuitive.
I don't know if I am asking too much, but I am sure the superb hacks powering Redmine's evolution, can surely do it.
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Man K wrote:
> Completely Agree that a tags system is desperately needed in Redmine.
> Redmine is indeed a powerful and happy ting to use, tags would make it simply awesome.
> I guess, stackoverflow style tagging, issue tracking, and wiki composing would be incredible.
> It could make the very process and experience of Redmine usage - Agile, simple and self-intuitive.
> I don't know if I am asking too much, but I am sure the superb hacks powering Redmine's evolution, can surely do it.

Please see my note from #1448#note-106

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Man K wrote:
> Completely Agree that a tags system is desperately needed in Redmine.
> Redmine is indeed a powerful and happy ting to use, tags would make it simply awesome.
> I guess, stackoverflow style tagging, issue tracking, and wiki composing would be incredible.
> It could make the very process and experience of Redmine usage - Agile, simple and self-intuitive.
> I don't know if I am asking too much, but I am sure the superb hacks powering Redmine's evolution, can surely do it.

News and forums can be tagged too…
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+1
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+1
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I've proposed 2 patches in #1448, please see comment #1448#note-115
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relates,New,480,Wiki: Support categories tagging and autolisting
relates,New,1448,Add tags to issues
duplicates,Closed,6918,Tag system on issues, wiki entries, everything