I call “Log Manager” whatever lets you record, manage and view bird sightings.
The must of all of them, (in my humble opinion) is eBird, (Android (BirdLog) and Iphone (eBird) app are available).
Then beyond eBird, in europe they are plenty of website for doing that:
I use eBird because I think there are great benefits in using a unified system across borders (and birders). Not only do birds move across borders, rendering national websites artificial, but also if a significant number of people use the same platform, interesting statistical conclusions can be drawn from all these entries.
eBird has been lauched by Cornell Lab of Ornithology and Audubon society in 2002 as a tool to serves both scientist and birding community.