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Well-known middlewares are predefined and indexed in our database, and appear as selectable items in comboboxes. However, the middleware combobox available when editing a software solution is freeform, meaning you can enter any text in it. Entering a freetext value will index the middleware under the 'Other' predefined value, which may be found in search forms.
If you wish the middleware that your software solution is using to be permanently added in our database, then please use the EGI Helpdesk to let us know.