Quote:
Originally Posted by kondor
May be there are already existent solutions based on Open Source applications with a single identification system? Or some hosting services which allow to make flexible customizations?
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Obviously you'll get the full flexibility only with a self-hosted system. My concern is that this however is binding resources for security maintenance and update migration of data and patched code, resources that could be improving serna

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Maybe the key is what you really depend on: Things that are a must have for day to day operation, shared services that must have highest availability, they require a local instance. All the rest can be somewhere. For example,
vlc and wordpress use pootle, but videolan.org (the vlc guys) is running their own svn and git and trac.
Don't know your order of key things, here's mine:
- mail or forum
- irc
- source code
- bug and feature tracker
- wiki
- blog
- i18n, l10n
Somewhere in there you could draw a line and host anything below on sourceforge or google or such, just pulling a local backup of the data out there.
IMHO all the tools have pros and cons, and it doesn't really matter much which one you choose as long as it's usable from windows, mac and linux clients.
Last not least, if you have an internal infrastructure in the dmz anyway, and you have experience with the tools, and they are standard tools anyway --- why not just move public with that as a starting point? You can switch to The Perfect Tool and The Best Hosting Site as needed, and add openID support as you go.
S.