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LetsMonitor.org is a free service to enable website certificate owners to receive alerts when their certificates are close to expiring or misconfigured. The service will send notifications to multiple contacts.

Via river.

KeyStore Explorer is an open source GUI replacement for the Java command-line utilities keytool and jarsigner. KeyStore Explorer presents their functionality, and more, via an intuitive graphical user interface.

Via river.

RSS Guard is simple RSS/ATOM feed reader for Windows, Linux or Mac OS X which supports many online RSS services