 | Others
 | Free VMs - Japhar, KVM |
| Free APIs - NinjaRMI, GNU classpath |
| alternative compiler - jikes (from IBM) |
| jasmin, decompilers, obfuscators |
| Performance enhancers such as Mocha, JIT, Hotspot |
| Language extensions: pizza (GJ), polyj |
| Embedded systems tools: Jump |
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