| Dictionary APL | ⊕ 1965 | ↓ ↑ ⊕ Business Data Processing | ⊕ Array | ⊕ United States | nickname for Sharp APL |
| IVSYS | ⊕ 1965 | ↓ ↑ ⊕ Experimental and other | ⊕ Array | ⊕ United States | Early implementation of APL |
| Sharp APL | ⊕ 1965 | ↓ ↑ ⊕ Business Data Processing | ⊕ Array | ⊕ Canada | IP Sharp |