| Asynchronous binary counter (JK flipflops) | applet | webstart | print |
| Asynchronous binary counter (JK flipflops, slow) | applet | webstart | print |
| Frequency Divider (D flipflops) | applet | webstart | print |
| Synchronous counter (JK flipflops) | applet | webstart | print |
| Synchronous counter (D flipflops) | applet | webstart | print |
| Synchronous Up/Down Counter (JK flipflops) | applet | webstart | print |
| Asynchronous BCD counter (JK flipflops) | applet | webstart | print |
| TTL-series counters (7490,7492,7493) | applet | webstart | print |
| TTL-series 7493 binary counter | applet | webstart | print |
| TTL-series 7490 decimal counter | applet | webstart | print |
| TTL-series 7492 1:12 counter | applet | webstart | print |
| TTL-series 74590 8-bit counter with tri-state outputs | applet | webstart | print |
| Four-digit decimal counter with TTL-series 74390 | applet | webstart | print |
| Four-digit frequency counter | applet | webstart | print |
| Counter-based pulse-generator | applet | webstart | print |
| Digital clock with BCD counters | applet | webstart | print |
| Digital clock with BCD counters (settable) | applet | webstart | print |