Here I have included some useful applications for our samsung galaxy star. You may use them for your phone (galaxy star only). I found S - Voice actually works (with some glitches) in galaxy star. These apps will not make system slow, I don't think you will need many apps other than this. It leaves approx 150 - 165 MB RAM in my system.
You must have a rooted galaxy star with cwm for some of these apps to work properly.
AVG Antivirus (Free)
G Cloud Backup (Free)
GO SMS Pro (Free)
GO SMS Emoji Pack + iPhone Theme (Free)
Titanium Back Up (Free)
ClockWorkMod ROM Manager (Free)
Shadow Galaxy Live Wallpaper (Free)
Vortex Galaxy Live Wallpaper (Free)
AT&T Code Scanner
360 Mobile Safe
Root Uninstaller (Free)
Backup Text for Whatsapp + Emoji Plugin
Whatsapp Messenger + Whatsapp Wallpaper Pack
Flashify Full v1.6.9
MX Player Pro (Free)
VLC v0.1.4 Beta
Simple Call Recorder (Free)
Dolphin Browser (Free)
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