As reported in a reddit post and confirmed in a github discussion, Simple Mobile Tools is being sold to ZippoApps which is known for shady business practices.
It is not yet clear whether they will make the app suite closed source (which would infringe the rights of all contributors since they contributed under the GPLv3 license).
In response to that situation, one of the main contributors forked the project under the name FossifyX and will continue to work on it.
This is open source at its best: the original developer somehow decided to sell out to the dark side and someone rescued the projects within a couple of days. Brillant!
And thank goodness for that too: I used SMT Calendar but Etar misses a couple of features I really need that would make it a good replacement, so I’ll be sure to install FossifyX Calendar as soon as F-Droid picks it up.
It’s pretty ungrateful to frame someone who developed and provided software for free for a long time as a sellout.