PastoDeco© is a diving decompression planner.
Starter edition is a free version that allows you to plan Air, Nitrox, Trimix dives within 45m./ 148 feet and max time of 60 minutes.
It uses both Buhlmann ( zh-l16A, zh-l16b and zh-l16c ) and VPM/B and VPM/B-GFS decompression models.
Units are in metric or imperial.
To get more from PastoDeco, you can choose between PastoDeco Light or PastoDeco pro versions.