Revive Adserver is a free, open source ad serving system that enables publishers, ad networks and advertisers to:

Serve ads on websites, in apps, and in video players, and collect detailed statistics about impressions, clicks and conversions
Manage campaigns for multiple advertisers and from ad networks all at once, via an easy to use interface
Define rules for delivery of campaigns and ads, including frequency capping, URL targeting, geo-targeting
Track and report campaign performance, including click-through rates, conversion rates, revenue, eCPM and conversion details, like basket value and number of items purchased

Concerning about the features, we can list the following:

Theming and color schemes.
Configurable hotkey schemes.
GNU Screen style hotkeys available by default.
Full Unicode support including double-width characters.
Doesn’t choke on fast-flowing outputs.
Tab persistence on macOS and Linux.
Proper shell-like experience on Windows including tab completion (thanks, Clink!).
CMD, PowerShell, Cygwin, Git-Bash and Bash on Windows support.
Default Linux style hotkeys for copy (Ctrl+Shift+C) and paste (Ctrl+Shift+V).
Multi-platform support. It supports Windows, macOS and Linux.
Free and open source.

Now that you have a VPS up and running smoothly, you want to keep in that way—or, at the very least, know if something goes wrong. Luckily, a huge variety of monitoring solutions exist to help give you a head’s up if an entire server crashes, a webapp is taking too long to respond, or you’re hitting your CPU limits.

Now, there are some truly excellent enterprise-level monitoring suites out there, if that’s of interest to you. We called out New Relic in the headline, as it’s one of the most popular monitoring solutions out there, but the competition is fierce, with other players like Pingdom, Twilio, and Stackify trying to get some of the monitoring marketshare. But even though many of these solutions have a free tier, we think it’s possible to get much of the same functionality without being boxed into a SaaS application.

With that said, we’re going to focus on open source, self-hosted alternatives that don’t cost you a penny.

It should be noted that not all of these applications perform the same function, or include the same features, so don’t think of this list as a side-by-side comparison between any of these 7 applications, or any of the other ones mentioned above.

Here’s some of our favorites.