Letter J
| JS | 11 projects |
| js classes | 1 project |
| jsclasses | 6 projects |
| jsdoc | 1 project |
| jsf | 11 projects |
| JSLint | 1 project |
| jslinux | 1 project |
| jsmin | 1 project |
| JSON | 110 projects |
| JSON API | 5 projects |
| Json for C++ | 2 projects |
| JSON Java | 1 project |
| json rpc | 2 projects |
| JSON validation | 1 project |
| JSON-RPC | 11 projects |
| JSONP | 1 project |
| jsoup | 2 projects |
| jsp | 30 projects |
| JSP API | 1 project |
| jsr | 1 project |
| jsr160 | 1 project |
| jsr170 | 2 projects |
| jsr283 | 1 project |
| jsr80 | 1 project |
| Jss | 1 project |
| jstl | 1 project |
| jsunit | 1 project |
| jtag | 1 project |
| jtl-wawi | 1 project |
| JTOpen | 1 project |
| juce | 2 projects |
| judo | 1 project |
| jukebox | 3 projects |
| Julius | 1 project |
| jump | 1 project |
| jumpbox | 6 projects |
| JUNG | 1 project |
| juniper | 1 project |
| junit | 24 projects |
| JVM | 13 projects |
| Jwm | 1 project |
| JWPL | 1 project |
| JXTA | 1 project |
| JyConsole | 1 project |
| Jython | 15 projects |
