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Eclipse Temurin vs IBM Semeru Runtime Open Edition: catalog facts
Eclipse Temurin	IBM Semeru Runtime Open Edition
Free Free to download and use with no licensing fees.	Free Free to download, with optional paid enterprise support from IBM.
Windows, macOS, Linux	macOS, Command line
Java SE TCK certified OpenJDK builds Built from open-source scripts and infrastructure	Uses the Eclipse OpenJ9 JVM instead of HotSpot Drop-in replacement for other OpenJDK builds
Provides the runtime and JDK only, not an IDE or build tools	Only useful to people running or developing Java software OpenJ9 tuning options differ from HotSpot
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0 WITH Classpath-exception-2.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.