Visual Studio Code, Sublime Text, Notepad++, Eclipse, Codeanywhere, TextMate, VSCodium, CodeRunner, Qt Creator, Lapce, Notepad3, Bluefish Editor, Jota Text Editor, Code Master, Pico Compiler, CudaText, Koder Code Editor, Buffer Editor, 920 Text Editor, DtPad, TouchDevelop, TeaCode are some alternatives to Textastic.