Japan Earthquake Real-Time App
Other softwares doing Seismic Data monitoring exist in Japanese. Here is a list of some of them:
The most famous Windows-only client made by compo031. The user should consider this choice if ressource consumption is an issue. Its ancestors (Kyoshin EEW Viewer + Quail Eggs) inspired the initial design of JQuake.
One of the first monitors ever to exist. The station database JQuake uses is derived from the one created by EqWatch owner.
Open Source C# Monitor for Windows 10 64 bits currently under continuous development.