These are just a few of the many digital pattern companies out there! I don't have a dongle for encrypted sites, (so they are not listed below), but I keep index cards for websites handy. Some of these sites sell other/many other designers' pattems, as noted, and even though a designer may have a site (KarleePorter.com is one of my favorites), his or her designs may also be offered on other sites (and sometimes on sale there too).
And while I have my go-to sites, I sometimes need something different. For example, ThreeSistersFabric.com has a p2p meander pattern that can come in handy! StitchHappy.com has some great stack n whack designs, and some for little twister blocks too.
Here's a few more (I've asterisked the sites I've used):
Where do you find your favorite digital quilting patterns?
In Stitches, Wanda