Use maven and gradle as a build tool (100% free maven repository server)

What you can get after reading this post

1. Find and deploy public maven package
2. Deploy maven-based project on github on demand
3. Convert non-maven-based project to built by maven.
4. Make you own private repository using bitbucket to create private package.(100% free)

Find and deploy public maven package in central repository

Search - http://mvnrepository.com/
Deploy - http://central.sonatype.org/

Deploy maven-based project on github on demand

Use https://jitpack.io/

Convert non-maven-based project to built by maven.

Create a maven project->copy own project to maven based project

Make you own private repository using bitbucket to create private package.(100% free)

Creating maven repository
https://bitbucket.org/neil_rubens/rapidminer_maven-repo/wiki/Home

http://mvn2gradle.codetutr.com/

Maven Repository is just a file directory with a group of maven based jar which allow communication with maven
(Private repository require http auth)