For the want of a nail the shoe was lost,
For the want of a shoe the horse was lost,
For the want of a horse the rider was lost,
For the want of a rider the battle was lost,
For the want of a battle the kingdom was lost,
And all for the want of a horseshoe-nail.
- Benjamin Franklin, Poor Richard's Almanac [well, at least this version of the proverb]
There are a lot of great software products out there and a lot of companies and developers do a great job of giving their customers what they need. But sometimes you need a capability that isn't there and that's where the a "third-party" comes into the picture.