fastlane vs Gemfury: What are the differences?

fastlane: Connect all iOS deployment tools into one streamlined workflow. fastlane lets you define and run your deployment pipelines for different environments. It helps you unify your app’s release process and automate the whole process. fastlane connects all fastlane tools and third party tools, like CocoaPods; Gemfury: Private ruby gem hosting. Hosted service for your private and custom packages to simplify your deployment story. Once you upload your packages and enable your Gemfury repository, you can securely deploy any package to any host. Your private RubyGems, Python packages, and NPM modules will be safe and within reach on Gemfury. Install them to any machine in minutes without worrying about running and securing your own private repository.
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fastlane and Gemfury are primarily classified as "Mobile Continuous Integration" and "Hosted Package Repository" tools respectively.

Some of the features offered by fastlane are:

• Connect all build tools together
• Define multiple lanes for different needs
• Jenkins Integration

On the other hand, Gemfury provides the following key features:

• Gemfury works with RubyGems, Python packages, NPM modules, and all compatible frameworks and services.
• Authenticated Repo-URL keeps your private packages safe and secure during deployment. All management and deployment is done over SSL.
• Do everything you need with just a few terminal commands.

fastlane is an open source tool with 26K GitHub stars and 3.97K GitHub forks. Here's a link to fastlane's open source repository on GitHub.