Textplorer is described as 'supports data field coloring in structured files, ANSI, OEM, EBCDIC, MAC or user defined character sets, CRLF detection, bookmarks, fast load of large files,' and is an app in the Development category. There are more than 50 alternatives to Textplorer for a variety of platforms, including Windows, Linux, Mac, BSD and Chrome OS. The best alternative is Visual Studio Code, which is free. Other great apps like Textplorer are Notepad++ (Free, Open Source), Vim (Free, Open Source), VSCodium (Free, Open Source) and gedit (Free, Open Source).
VS Code is more than just a code editor, it provides the tools and extensions to compile, debug, compare, refactor, and even manage code repositories all within a highly-customised development environment.
CudaText is a cross-platform text editor, written in Lazarus. It starts quite fast (0.5 sec with ~30 plugins on CPU Intel Core i3 3Hz). It is extensible by Python add-ons (plugins, linters, code tree parsers, external tools).
ReText is a simple text editor for Markdown and reStructuredText documents with syntax highlighting and optional live preview. It is written in Python using Qt libraries, able to run on any platforms (Linux and BSD are officially supported).