1.12.x] KSP Resonant Orbit Calculator - Add-on Releases - Kerbal Space Program Forums
Steam Community :: Guide :: Math
KSP Orbit Calculator APK for Android Download
KSP Orbit Calculator APK for Android Download
KSP Visual Calculator
KSP Orbit Mechanic 1.2a: Optimize Your Orbits - Tools and Applications - Kerbal Space Program Forums
Basics of Space Flight: Orbital Mechanics
1.2.2] SOC: Simple Orbit Calculator v1.5.0 (1/12/2017) - Add-on Releases - Kerbal Space Program Forums
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.