grizzly
                                Writing scalable server applications in the Java™ programming language has always been difficult. Before the advent of the Java New I/O API (NIO), thread management issues made it impossible for a server to scale to thousands of users. The Grizzly NIO framework has been designed to help developers to take advantage of the Java™ NIO API.
                            
                        How to download and setup grizzly
Open terminal and run command
                                            git clone https://github.com/javaee/grizzly.git
                                        
                                        git clone is used to create a copy or clone of grizzly repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with grizzly https://github.com/javaee/grizzly/archive/master.zip
Or simply clone grizzly with SSH
                                            [email protected]:javaee/grizzly.git                                    
                                    If you have some problems with grizzly
You may open issue on grizzly support forum (system) here: https://github.com/javaee/grizzly/issuesSimilar to grizzly repositories
Here you may see grizzly alternatives and analogs
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