Flexible Table Block (flexible-table-block) free WordPress plugin

Merge and Split Cells

You can merge or split cells from multiple selected cells.

Flexible Styling

You can set various styles for each tag of table, cell, and caption indivisually.

Advanced UI

You can easily select a batch of cells in a section, or select, add, or delete rows and columns with the buttons.

Responsive Support

You can set the table to scroll horizontally on both Desktop and mobile, and arrange cells vertically on mobile.
The breakpoints for switching between Desktop and mobile can be changed freely.