I have a Hoya keysii that is budding up now that has a fragrance of springtime, kind of like daffodils. They are easy to care for and root readily and mine blooms during the fall and late winter.
Then there are the scented geraniums in a multitude of delightful scents.
I also grow fragrant herbs over the winter like Rosemary, Basil, Oregano, Thyme, and Sage.
I'm sure I'll think of more later.

Kathy

gardenia radicans would be a good choice for a container.
same great fragrance of the larger gardenia augusta but more of a prostrate grower with much smaller leaves and flowers. can be pruned to contain size. i can't say about the flowering period if grown indoors but they bloom about the same time as the others when grown outdoors(early summer).
also, heliotrope is pleasantly scented to me with purple flower clusters that smell sort of like baby powder or moonflowers.
you may also have space for a fragrant flowering vine such as one of the jasmines or trachelospermums which could be allowed to either cascade out of its container, trained to a support or around the walls.

Thanks Everyone I'll look for the plants or seeds, I'm ready to get the greenhouse green again.

I hear ya. I just got some plants in the mail that I ordered last week. Lemon Verbena, Pineapple Sage, Honeydew Sage, Rootbeer plant, Orange Balm, Nashia, Orange Balsam Thyme, and Corsican Mint, all wonderfully scented!

Kathy

A huge chunk of this list is thanks to recommendations by a member named Ispahan:

Sansevieria parva
Begonia solananthera
Neomarica gracilis
Brassavola nodosa
Epiphyllum anguliger
Eucharis amazonica
Hoyas (obscura is my favorite and the one recommended by Ispahan; many others have strong scents, such as lacunosa)
I also like:
Forced hyacinths and lilies-of-the-valley
Primroses
Cyclamen (some)
Rondeletia splendens
Senecio rowleyanus, some tillandsias, and supposedly aloe haworthioides and stapelia flavopurpurea (have not tried the latter two).