| source engine steam | 0.04 | 0.3 | 4775 | 19 | 29 |
| source engine standalone | 0.7 | 0.9 | 622 | 24 | 12 |
| source engine sample tool | 0.44 | 0.4 | 2627 | 25 | 4 |
| source engine source code | 0.2 | 0.3 | 91 | 25 | 96 |
| source engine sdk | 0.17 | 0.2 | 5244 | 17 | 35 |
| source engine skyboxes | 0.85 | 0.7 | 1391 | 22 | 95 |
| source engine support | 1.88 | 0.4 | 1364 | 21 | 92 |
| source engine sound effects | 1.47 | 0.1 | 92 | 27 | 11 |
| source engine sdk 2013 | 0.07 | 0.3 | 6897 | 22 | 98 |
| source engine sounds | 1.22 | 0.6 | 5544 | 20 | 3 |
| source engine skies | 0.55 | 0.9 | 9166 | 19 | 98 |
| source engine source code leak | 0.85 | 0.1 | 7766 | 30 | 68 |
| source engine shaders | 1.9 | 0.3 | 5328 | 21 | 40 |
| source engine sfx | 0.66 | 0.4 | 8929 | 17 | 41 |
| source engine shadows | 1.97 | 0.6 | 3858 | 21 | 45 |
| james watt steam engine primary source | 1.63 | 0.8 | 4566 | 38 | 12 |
| steam engine primary source | 0.96 | 0.6 | 1573 | 27 | 27 |
| source engine games steam | 1.61 | 1 | 5588 | 25 | 32 |
| primary source of fuel in steam engine | 1.69 | 0.6 | 5753 | 38 | 11 |
| steam engine power source | 0.36 | 0.9 | 1133 | 25 | 32 |
| source of fuel in steam engine | 1.82 | 1 | 9054 | 30 | 89 |
