SHODAN has a service where you can use them to monitor your your stuff if you have an account with API access. Schedule and run scans, get alerts if something new or unexpected appears. Has its own API and CLI tool, too.
Beehive is an event and agent system, which allows you to create your own agents that perform automated tasks triggered by events and filters. It is modular, flexible and really easy to extend for anyone. It has modules (we call them Hives), so it can interface with, talk to, or retrieve information from Twitter, Tumblr, Email, IRC, Jabber, RSS, Jenkins, Hue - to name just a few. Check out the full list of available Hives in our Wiki.
wait-for-it.sh is a pure bash script that will wait on the availability of a host and TCP port. It is useful for synchronizing the spin-up of interdependent services, such as linked docker containers. Since it is a pure bash script, it does not have any external dependencies.
A Python module for making it easier to write HTTP services and REST APIs. One import and then you can define the request routers however you want. Uses Jinja templating internally so you don't have to mess with it yourself. Embedded HTTP server is said to be production-ready. Background tasks can be spun off into threads easily.
GraphQL can be implemented with Graphene.
OpenAPI can be implemented with Marshmallow.
Requires Python v3.6 or later.
Documentation and Test Consoles for Over 500 Public APIs
A sizable directory of public APIs for people to mess around with. Some are fun, some are serious, some are business related, and some are utility APIs.
Described as the Craig's List for science.
What the services started at boottime by Fedora 7 do and whether or not it's safe to mess with them.
An online service that acts as a telephony middleman - you tell them what number to call, what number you want to show up on both Caller ID and the bill, and what your number is, and they'll connect the two numbers with the spoofed information of your choice.
A public mailing list service that caters specifically to F/OSS projects and Free Culture collaboration. No ads, no censorship, no frills.
A Git repository of config files for various network services that hardens their settings and sets up SSL and/or TLS to encrypt traffic.
Somebody's implemented mDNS/multicast DNS/Bonjour/Avahi/Zeroconf in Java. The classes allow developers to give their applications the capability to announce themselves on the local network so that other systems can find them.
How to disable system services controlled by Upstart on Ubuntu and Debian systems.
A website that monitors an extremely large number of online services to keep track of whether or not they're accessible. If you use a service, chances are they're keeping a sensor on it to detect downtime.
An awesome list of resources for building bots.
An odd little website that seems to have links to some services that could prove useful.