1Weather

This is a relatively new ad supported free weather app made by  OneLouder Apps developer of many famous apps like tweet caster , friend caster etc. As the name suggests it show weather of a particular location. Along with weather it also shows other parameters like 7 Day forecast, Severe weather alert, precipitation levels, radar maps (currently only for US) , sun and moon rise and set times and even tweets and pics about the temperature of the selected city. It also includes a weather widget showing latest weather for a selected city.

Performance :- Its a lightweight app having very fast load times. The temperature readings are off by a few degrees as compared to the weather channel , weather bug and other weather showing websites. 

User Interface :- Nice animated user interface, odd color combinations but all together not very flashy.  

Known Glitches and Bugs :- Does not include automatic location detection, temperature off by a few degrees.

Navigation and Usage :- Navigation is simple but the app contains a lot of unnecessary information like tweets about temperature(now who wants to reads tweets about temperatures),top weather pics.

Addiction level :- Well there are other better weather apps like The weather channel , Weather Bug  in market than this so addiction level is quite less.

You can download it from Here.

Onavo

Its a new data usage monitor developed by Onavo . It tracks the mobile data (both edge and 3g) being used by your phone, stores the information ,processes and displays it in various formats. It has many useful features including app-wise data  tracking, monitoring apps for extensive data consumption, providing you graphical analysis of data used and even suggests better data plans based on your usage.You can define your plan (monthly,yearly or daily) and even set alerts on limit of data usage.It also provides 3 widgets for the home screen including live data widget,app widget and data plan widget. Sadly it only tracks mobile data and not Wifi.

Performance :- Its provides very accurate information compared to other apps and load times are not even significant. The only thing is that you can only set the start date of your plan and end date is calculated accordingly without giving user the choice to set it.

User Interface :- It has a very elegant and subtle user interface supporting color changes according to the data usage.

Known Glitches and Bugs :- None

Navigation and Usage :- Navigation in this app is very easy and with the added functionality of widgets its easy to use too.

Addiction level :- Depends on your usage . If your are a frequent mobile data user than this app will be hard to uninstall.

You can download and install it from Here