[adult swim] to Toonami's "Midnight Run" block. Several anime series that aired on Toonami ended up airing on Adult Swim during its first year. The fact that it is run by the same studio that ran Toonami, Williams Street, was a plus. These comparisons stopped, however, when [adult swim] (and Cartoon Network in general) underwent significant Network Decay.
And now Toonami is a spiritual successor to Adult Swim's early years in an ironic and cyclical way.
Free/Open Source Software is often forked. This occurs when the developers that had been working on the project become frustrated with those in charge and decide to continue development in a different direction. In many cases this results in the original software project withering as developers and users are attracted to the new project.
The free/open source office software LibreOffice is essentially a spiritual successor to the older and also free/open source OpenOffice.org suite; after Oracle bought Sun Microsystems, the latter of which sponsored and maintained the latter, the developers quit and joined the LibreOffice team. The LibreOffice maintainers did try asking Oracle for the OpenOffice.org trademark, as they originally planned to be a regular successor to OpenOffice.org, but after that didn't happen, LibreOffice became an independent software suite that took the code of OpenOffice.org and expanded on it. Several Linux distributions, including Ubuntu, eventually replaced OpenOffice.org with LibreOffice.
Oracle later threw the code and trademarks at Apache OpenOffice at IBM's behest, so AOO also claims to be the legitimate successor. LO has more development, AOO has more downloads. Some forks are more bitter than others.
Similarly, the Mozilla Suite, which was eventually split into the Mozilla Firefox Web browser and the Mozilla Thunderbird email client, are essentially spiritual successors to Netscape; originally Mozilla was intended to be a codebase for the proprietary Netscape suite, but Netscape was discontinued and Mozilla's projects continued development, with Firefox and Thunderbird being maintained by Mozilla subsidiaries and the Mozilla Suite was rebranded and continued as the community-maintained SeaMonkey suite, which in turn succeeded the entire Mozilla Suite rather than parts of it.
The Raspberry Pi computer, a $35 single-board Linux machine the size of a credit card, is meant as a successor to the BBC Micro, with its low cost and heavy emphasis on computer science education for children. The Raspberry Pi Foundation laments the change in emphasis from open computer platforms that encouraged experimentation and programming at an early age in the 80s, to using office software and depending on closed-source programs just to get basic computing done of the present day, and they hope the success of their product (which crashed the two stores that sold it on launch day and at one point was said to have received 700 orders per second) will bring about a renaissance of children tinkering with their computers' internals just like the heyday of the 8-bit computers. It goes so far as to have two models, a basic Model A and an enhanced Model B (now on sale, unlike the A), just like the BBC Micro did, and even sweetens the deal by having 1080p h.264 playback capability at 30 fps.
France's Musketeers of the Guard where not all that different from their Knight counterpart. Like Knights, the Musketeers where also from the nobility and were the Special Forces during their time.
Oreo cookies are the spiritual successor of Hydrox cookies.
After the demise of the Amiga, a number of users migrated to Linux.
The Amiga itself was the spiritual successor to the Atari 8-bit line, as it was developed by many of the same people with the same design philosophy. In a better world, it would have been made at Atari.