Top pick
Community builds of VS Code OSS without Microsoft branding/telemetry defaults.
idelspextensions
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8 tools match your filters
Honorable mention
Rust LSP server that plugs LLM-backed completions into editors—designed to pair with local or API models.
lspidellmdeveloper-toolstaaft-repositories
JetBrains Java/Kotlin IDE open-core edition.
idejavakotlin
Top pick
Microsoft’s widely used editor with extensions and Language Server Protocol.
ideextensionsmicrosoft
Also strong
Modular Java-first IDE platform with marketplace plugins for dozens of languages and toolchains.
idejavaeclipse
Honorable mention
Apache-licensed IDE with strong Java, PHP, and HTML5 tooling and Ant/Maven integration.
idejavaapache
Honorable mention
Free C/C++/Fortran IDE built around wxWidgets with multiple compiler backends.
idecppwxwidgets
Honorable mention
Delphi-compatible RAD IDE for Free Pascal—cross-compile GUI apps with the LCL widgetset.
pascalidegui