There is also the Super Dimensional Fortress[1] that's been around for over 40 years. The basic membership is free and even the top of the line MetaARPA[2] with

There is also the Super Dimensional Fortress[1] that's been around for over 40 years. The basic membership is free and even the top of the line MetaARPA[2] with access to the MetaArray[3] is ridiculously inexpensive... [1] http://sdf.org/ http://sdf.org/ [2] https://sdf.org/?join https://sdf.org/?join [3] https://sdf.org/?tutorials/metaarray https://sdf.org/?tutorials/metaarray