QuickPlan 2.1 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. QuickPlan for Mac belongs to Games. This Mac application was originally produced by FSWIDGETS.
From the developer:
QuickPlan is a visual point-and-click flight planner that makes it easy to generate flight plans in native FSX, FS2004 or X-Plane formats. The entire route is generated visually, by clicking the map to add the departure airport, intermediate waypoints and arrival airport in the same order that you intend flying the plan.
You may want to check out more Mac applications, such as QuickPlan Slack BOT, which might be similar to QuickPlan.