FNode
                                Tool based in nodes to build GLSL shaders without any programming knowledge written in C using OpenGL and GLFW.
                            
                        How to download and setup FNode
Open terminal and run command
                                            git clone https://github.com/victorfisac/FNode.git
                                        
                                        git clone is used to create a copy or clone of FNode 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 FNode https://github.com/victorfisac/FNode/archive/master.zip
Or simply clone FNode with SSH
                                            [email protected]:victorfisac/FNode.git                                    
                                    If you have some problems with FNode
You may open issue on FNode support forum (system) here: https://github.com/victorfisac/FNode/issuesSimilar to FNode repositories
Here you may see FNode alternatives and analogs
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