CyberChef
https://gchq.github.io/CyberChef/ciphereditor
https://ciphereditor.com/Cryptii
https://cryptii.com/Cryptii v2
https://v2.cryptii.com/text/selectXlate
https://paulschou.com/tools/xlate/ (has custom octal)dCode
https://www.dcode.fr/ (top tier)GeocachingToolBox
https://www.geocachingtoolbox.comRumkin
http://rumkin.com/tools/cipher