I have been using Amateur Contact Log from N3FJP, in the shack since 2007 and the updates that have been issued over the years by Scott & Kimberly have really seen the product stand head & shoulders above its competitors. The latest version, 4.5 looks and performs exceedingly well. Radio integration & DX spotting, LOTW are also easily configured. There is also a very active Yahoo group.
Scott has also been updating his contest software suites, so I decided to try them out a few months ago and I now use them in all the contests that I participate in. There are also a lot of other logs on Scott’s site and are equally well written.
Cost: You can register all of Scott’s software for $49.99, which is very reasonable and worth it alone for AC Log!
There are lots more features that I have not mentioned, so go to Scott’s site and have a look!