I use Github email notifications to keep on top of issues. GH lets you use different email addresses for each organization you belong to, and then you can use a

I use Github email notifications to keep on top of issues. GH lets you use different email addresses for each organization you belong to, and then you can use an email filter rule to separate issue traffic from the rest of your inbox. Admittedly far less powerful than this desktop app, but also simple, free, and native (via my native mail app). It handles a lot of my needs.