GPSBabel has been around since the relatively early days of open source and we use lots of tools by others to help make us awesome. We've grown to rely on many services that just weren't around when we started, so we really appreciate our relationships with the following.
Codacy provides us with a set of quality tools to help ensure that we're making continuous strides on improving code quality
needs little introduction. They provide the home for our collobarative code
development, the GPSBabel git repository, issue trackers.
Importantly, they provide us with GPSBabel's continuous integration. Their build systems dutifully test and run every proposed change on at several combinations of compiler, operating system, instrumentation and such.
Jetbrains provides a vast array of tools, but we're thankful for CLion's tools for refactoring code and powerful analysis tools.
JFrog provides us with access to Artifactory, which we use for caching Qt builds in our pipeline.
Macstadium provides us with a dedicated Mac in a hosted environment. Enterprise-class Mac hardware in a datacenter solves a lot of problems for us. (Like being able to afford Macs from free software...) This service absolutely helps us deliver GPSBabel on MacOS.