In addition to the above apps, some older apps are still available, though are discontinued and no longer updated. These include Macfilink and QuickEncrypt 4 for macOS, and many older applications and tools are available for Mac OS 9 and earlier. Plus SmileDial and Valentines for iOS. These are all completely free.
Dejal Systems, LLC is an independent macOS and iOS software development company, owned and run full-time by David Sinclair. Dejal has been based in Portland, Oregon since 2001; it was originally established in New Zealand in 1991. The name "Dejal" is pronounced DEE-JILL. See the About Dejal page for more information.