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Niotron IDE. No installation, but I don’t really recommend it because a lot of features, such as helper blocks and assets, are not supported, but good for a beginner. It’s here: https://ide.niotron.com/.
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Extensions template. Requires the installation of both Java and Apache Ant. Supports helper blocks, multiple Java files, and all essential features.
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Rush. Supports the Kotlin language, less annotations, and Java 8 features in libraries.