RiiConnect24 is described as 'Alternative provider for the now-defunct WiiConnect24 service, designed to allow communication between Nintendo Wii consoles via the net. Thllows you to use services such as the Forecast, News, and Everybody Votes Channel again, and exchange mail between' and is an game in the games category. There are 2 games similar to RiiConnect24 for a variety of platforms, including Mac, Windows, Linux, Android and Self-Hosted apps. The best RiiConnect24 alternative is WiiLink, which is both free and Open Source.
WiiLink is an open source replacement for Nintendo's servers for both WiiConnect24 and Nintendo Wi-Fi Connection, allowing online connectivity for all, even after the original servers were discontinued!.
WiiConnect24 was a feature of the Nintendo Wi-Fi Connection for the Wii console. It was first announced at Electronic Entertainment Expo (E3) in mid-2006 by Nintendo. It allowed the user to remain connected to the Internet while the console was on standby.
Japan
They're the same project starting from circa 2024. Initially, it offered channels exclusive to Japan, with it merging with RC24 later.