There is no list of supported versions (with list of EOL dates).

In general, we follow rather simple path: we support latest major stable version (in this case 8) with regular bugfixes and severe security/vulnerability fixes being ported do previous stable (7 - in this case 7.1.x versions).

We do encourage everyone to update to the latest stable version. Tigase 7.0.2 was released almost a decade ago, and it's not supported anymore.