Projects in GlassFrog can be placed into an "Archived" state to remove them from the main project listings. Archived projects are only accessible to Premium users through the search feature.
From any page, you can access to archived projects by clicking on the magnifying glass icon next to the Search bar and then on the link provided.
That will open the Search Projects page where you can enter different filters for your search such as keywords, dates, or status.
Note that the result will not be clickable and will only provide the information shown in screenshot: