theia
                                Eclipse Theia is a cloud & desktop IDE framework implemented in TypeScript.
                            
                        How to download and setup theia
Open terminal and run command
                                            git clone https://github.com/eclipse-theia/theia.git
                                        
                                        git clone is used to create a copy or clone of theia 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 theia https://github.com/eclipse-theia/theia/archive/master.zip
Or simply clone theia with SSH
                                            [email protected]:eclipse-theia/theia.git                                    
                                    If you have some problems with theia
You may open issue on theia support forum (system) here: https://github.com/eclipse-theia/theia/issuesSimilar to theia repositories
Here you may see theia alternatives and analogs
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