I use OpenOffice/LibreOffice since many years and do all development initially with Calc. Many of my operative tools were made with Excel - The engineers best friend.
Excel suffered from instability and compatibility issues (new versions) and LibreOffice excelled with stability and robustness and performance in very complex spreadsheet projects.
I wanted to see what is possible with Calc/Basic and made a competitor for all those Excel - Pacman clones out there. I’ll add a link to a video clip (a 1.5 MB .gif upload failed).