Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.

Pterodactyl - Pterodactyl is the free game server management panel designed by users, for users.

Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.

McMyAdmin - McMyAdmin is a web interface and administration utility for Minecraft Survival Multiplayer (SMP)...

Virtuagym - Virtuagym is a unique, all-in-one fitness solution tailor-made for fitness businesses of all sizes...

Pufferpanel - It's made for hosting your Minecraft server. It's open source.