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dev.xoops.org is a Development site. If you have other people's modules and want to continously develop on them and want to be part of the development community, you are free to open new projects for them on dev.xoops.org
However, if you have a new modified version with bugfixes and/or new features and just need a place to make it available for download, you can submit it to the Modules Repository here on the site.