I maintain an open-source Notepad++ plugin called Markdown Table Editor. I built it because editing wide Markdown pipe tables by hand—especially tables pasted from generated output or converted from CSV/TSV—was slow and error-prone.

Version 11.2.0 is available through Plugins Admin for x86, x64, and ARM64:

Plugins > Plugins Admin > Available > Markdown Table Editor

The three workflows I use most are:

• automatic alignment after edits, without changing the intended column widths;
• fitting a wide table to the visible editor width by wrapping and rejoining cell content;
• converting selected CSV/TSV text, or the current CSV/TSV block, into a Markdown table.

The plugin also supports cell navigation, row and column insertion/deletion/movement, sorting, Markdown alignment markers, escaped pipes, and Unicode/CJK display widths.

Source, documentation, and releases:
https://github.com/krotname/NppMarkdownTableEditor

If you edit Markdown tables in Notepad++, I would appreciate feedback—particularly on the automatic alignment and width-fitting behavior with real-world tables.