Your "why is this not stock" mods

[RizzoTheRat]

Did a fresh install last night so focussed my mind on what I consider essential

• KER - While I need the dV calculation in the VAB, the thing I find I miss the most on a craft I've got to put the module on is the dV remaining.
• RemoteTech - I love the feel of added realism, makes me plan a bit differently too.
• ScanSat - I guess not essential but I love the big maps.  Useful for early game science and "science from X" missions.
• KAS/KIS - Don't use it that often but occasionally add struts to docked modules or add new science experiments to existing landers.
• MechJeb - I know it has it's haters but I use it to do repetitive stuff I could do myself but can't be bothered (circularisation burns, match velocities, etc.), and I'll often set up a node manually and have MechJeb execute it which is particularly useful on long burns.