For those interested in big board variants, Chu Shogi is now

Chu Shogi Dr Eric Silverman

Simple Wooden Shogi Set by Philos : : Toys & Games

Shogi - Rules and strategy of shogi games

Why is Shogi the only chess variant in which captured enemy pieces can be reused as one's own? Why did this not become a thing in other chess variants? - Quora

Variant] Chushogi · Issue #472 · WandererXII/lishogi · GitHub

Moving forward looking back

Shogi and Shogi variants

Chushogi

Are there any Ko Shogi apps out of Japan I can get for my iPad? - Quora