| Title | Company | License | Price | Avg Rating | Downloads |
| CFB Primes | CFB Software | Freeware | $0 | NR | 19 |
| find the prime factors and closest primes of any integer up to one billion (us) |
| Cheat Checker | Nine-Patch Software | Freeware | $0 | NR | 105 |
| the cheat checker checks the similarity and uniqueness of paired answer sheets. |
| Chemical Equation Expert | Etiumsoft | Shareware | $24.95 | NR | 87 |
| a tool to balance and calculate equations. |
| Chord Miner | Charanga Ltd | Shareware | $22.99 | NR | 151 |
| the ultimate chord reference and repertoire tool for all levels of guitarist |
| ChordSMART | NSA Software LLC | Demo | $14.95 | NR | 70 |
| 1200 chords in this quick and easy program. |
| Complete Beowulf Interactive | Pathos Learning | Demo | $19.95 | NR | 90 |
| beowulf taught in its context with questions and scoring |
| Complete Macbeth Interactive | Pathos Learning | Demo | $29.95 | NR | 68 |
| macbeth taught in its context with questions and scoring |
| Covalent Bonding | Raylec Software | Shareware | $42 | NR | 46 |
| interactive chemistry teaching software. |
| Crammer | Korzh.com | Shareware | $29.95 | NR | 48 |
| highly customizable reminder tool useful for learning words, math, history, etc. |
| Crossword Express | AUS-PC-SOFT Shareware | Shareware | $35 | NR | 156 |
| make your own crosswords and other word puzzles using your own words and clues. |
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