A more accurate delta-v map : r/KerbalSpaceProgram
Calculation tools - Kerbal Space Program Wiki
1.12.x] KSP Resonant Orbit Calculator - Page 2 - Add-on Releases - Kerbal Space Program Forums
Adventures in Kerbal Space Program, kOS & Math (Part 1) - Troy Fawkes
KSP Visual Calculator
1.12.x] KSP Resonant Orbit Calculator - Add-on Releases - Kerbal Space Program Forums
KSP Orbit Mechanic 1.2a: Optimize Your Orbits - Tools and Applications - Kerbal Space Program Forums
KSP Orbit Calculator APK for Android Download
My new Delta-V Calculator/Planner! : r/KerbalSpaceProgram
KSP Resonant Orbit Calculator on SpaceDock
GitHub - Blaarkies/ksp-visual-calculator: Online tool for Kerbal Space Program that helps players determine delta-v requirements for a mission, and what type of comms dishes a certain satellite requires.