Out of all the synonym families for rich, the words that I think fit most closely to your purposes are the words under abundant:
One word that I might recommend isn't listed there, though; I think the word replete might work. NOAD says:
filled or well-supplied with something
Moreover, Collins defines replete as copiously supplied with. So, one might say:
My aunt's house is replete enough in tapestries that she does not need to buy any more.
The FOSS community is replete with office space. As a matter of fact, you don't even need to rent an office, there’s an abundance of free office suites available.
If you want to use something informal, I think the synonym crawling with makes for some interesting language:
The FOSS community is crawling with office space.
NOAD says that crawling with means to be covered or crowded with insects or people, to an extent that is disgusting or objectionable, while Collins reads: to be or feel as if overrun by something unpleasant, esp crawling creatures. So, applying that phrase to a hypersufficiency of office space might be somewhat metaphoric, and the phrase crawling with might be more fitting if the overabundance of office space or tapestries was viewed as a bad thing. I might use those words in conversation, but I'd probably avoid it in more formal writing.
By the way, overabundant might be a good word, too; from Collins:
overabundance (n.): a supply or amount that is greater than required
overabundant (adj.): too abundant; excessive
So, one could say:
There is an overabundance of office space in the FOSS community, and my aunt's house is overabundant in tapestries. (That's why she never stops by the tapestry store on her way home from her freely-rented office space.)