I'm using Charter Oak State College. This is because they are an accredited and respected school, specializing in in distance learning, which accepts a high enough score on a recent Computer Science GRE exam for credit-by-exam on many of the course requirements, and (if certain requirements are met, such as being active in an industry using them) accepts older credits (i.e. math, distribution requirements) that many other institutions would consider "stale" and timed-out. They do not currently offer a BSCS, however, so I'm going for a BSGS with a CS concentration. I've taken three classes from them so far, and am currently taking a math class (needed but not offered there) from the University of North Dakota for transfer credit. Several of my few remaining requirements I expect to complete by exam (and a couple - public speaking, English - by waiver due to documented work experience).
Another excellent school (with a more technical orientation) that also specializes in distance learning is Thomas Edison. They do offer a BSCS, but stopped accepting the CS subject GRE for credit (because too few students used it for them to continue the effort of keeping it qualified against their own requirements). In my case this made a big difference in how much work would be required to reach the diploma. For some others, especially those who need many of the classes (or test-out equivalents), are tech focused, and would find the more directly applicable degree a benefit, Thomas Edison would be a good choice.
These schools are oriented toward people who wish to complete their degrees but are employed or located where going to a classic college is impractical. Examples: Deployed military personnel, low-level medical employees seeking higher certifications for career advancement, workers located far from a good subject-appropriate school or working schedules that interfere with school scheduling.
Two credit-by-examination programs are also related to this. DANTES is one - driven by the military's need to provide education for their soldiers without interfering with their duties (but open to all). Another is CLEP (College Level Examination Program), a product of the College Board which provides 33 subject tests which are accepted as proof of accomplishment by most universities. Each program lets you receive college credits without actually taking a class, by testing whether you've successfully taught yourself the subject.