What do you use to display / analyze your startup metrics?

Geckoboard has some pretty sweet integrations, so if you're looking for a dashboard type display, it's perfect.

We used this at Secret Escapes for all our dashboards. Definitely recommend.

Open source, quite robust and active development. Works like Periscope and Google Data Studio.

Mode is a powerful analytics platform that allows you to pull data from multiple sources and create beautiful dashboards.

We use Periscope at Product Hunt to visualize our data. We have several dashboards for individual projects (e.g. we have a dashboard for Ask Product Hunt, reporting the number of requests/recommendations, most helpful users, and more) and teams (e.g. the Discovery team monitors specific metrics that match with our OKR's). You'll need to know SQL and be very familiar with your db structure to create dashboards so for my non-technical friends, Geckoboard or other WYSWYG tools might be a better fit.

Open source, on-prem installation options, analytics + marketing in one product, extensibility with plugins

It hooks into our MySQL database and lets us add easy charts

Mixpanel Dashboards.