PeoplePress

It is currently in early stage of development and provides very basic functionality. 
We are looking forward to add more functionality with our upcoming releases.
Currently it offers login, password reset and a basic user profile with default fields.

It is lightweight user profile and account management plugin.

Dekisugi

This simple and lightweight plugin come with a widget that display the word Welcome along with the username of the current user. This is to give subcribers a sense of warm welcome and hospitality, when they come back to the blog.

Welcome User Widget

A plugin with a simple widget to display welcome message along with the user_login of the current user.

PeoplePress vs Welcome User Widget