ChemBuddy has a host of features to make life easier for you.  Here is a modest gallery for your perusal.
 
Screenshots
Limiting Reagents
Equilibrium
Dalton’s Law of Partial Pressures
Heat Energy Transferred
temperature.png
mole_fractions.png
Molar Mass Calculator
Periodic Table (Basic)
Periodic Table (Crystal Structures)
Periodic Table (Electron Blocks)
Periodic Table (Radioactivity)
Periodic Table (States of Matter at STP)