9 ... meter ... Designs explores the possibilities for 9m diameter rocket systems like SpaceX Starship
HLS Starship (Lunar Lander) Concepts
A suggested improvement on the Artemis concept ... replacing their gateway with a HLS Starship derived gateway ... or eliminating any gateway (image credit: reddit)
Shackleton Development Corp
A conceptual plan of how humanity can colonize the Moon starting with a base in Shackleton Crater at the Lunar South Pole
SiMars: Simulated Mars Experience
A conceptual plan for a one week experience that offers a 30 minute sub-orbital Starship flight to a Simulated Mars colony for a 5 day stay.
Mars2022
Time is running out ... can SpaceX perform a minimal mission in late 2022?
Mars2024
What might the second SpaceX Mars mission contain?
Mars Hopper?
An alternative landing system for Mars.
Mars2026
4 Starships: 2 Cargo, 1 MethLOX Factory and 1 Pivot Hab/Command Center (All unmanned)