G&G Software

Google Earth

I start having it since my Undergraduate. This allows me to see various places in the world and studies the landform (Geomorphology) and infer process involved. We can mark places on the map and load shapefile. 

ArcGIS

I used this heavily to generate map and perform spatial data analysis. This allows multiple published map to be georeferenced and analysed together to create more comprehensive evalution

Petrel

Owned by Schlumberger, this software allows Geological and Geophysical Analysis. Well and seismic data can be interpreted to generate various map to build subsurface model. Good for smaller but detail evaluation of an area.

DecisionSpace

Owned by Halliburton, this software had similar function as Petrel. I personally like this for Regional work at it has better spatial functionality and common database (Openwork) 

Geox

Used to perform prospect volumetric and risking assessment. A good calculator that can run both diterministic and probabilistic run

Microsoft PowerBI

Used for tabulated data analysis. this allow better data analysis and chart creation compared to Excel

G-Plates

This is Open Source software that i use to reconstruct plate Model and see how does the plat behave through time

 I-Handbook

I had used this free software offered by Schlumberger since i start working as Wellsite Geologist. It had user friendly unit coversion tool