Useful reports
Useful donationware
Paint.NET is a graphics editor which is a super replacement for Windows Paint. It has excellent select and fill tools as well as layering. This has been a firm favourite since other tools I used became over complicated.
Notepad++ is an amazing replacement for Windows notepad and can open multiple windows which is great for comparison, has excellent search and replace (including the use of regular expressions for pattern matching) and also has intelligent colouring of files if you are opening source code.
ganttproject is a basic GANTT chart creator and is quick to master compared to the leading tools, and whilst it is missing a few tools, it is great for doing a basic project plan to produce nice graphics to help communicate a small plan.
7Zip is the king of zipping tools and the father of the ultra-efficient 7Zip format. Whilst it is not updated often, it offers a great feature set, including file encryption, reading of ISO files and it integrates into windows nicely.
PDF24 is a great software that give you the ability to extract pages from a large PDF file to a smaller file to make easier to navigate and does a whole lot more too!
Floundering in Windows 8 looking for desktop menus? Classic shell adds a familiar experience in terms of restoring the start menu.
Useful paid software
Global Mapper is an amazing GIS tool. For a few hundred dollars, you can import, view and export vector and raster GIS data to a wide range of formats. Creating composite maps is easy, whether as a GIS layer for export, or a pretty graphic for a report. The tool even has a path profile interface!
PDF2XL is a tool that allows you to take tables in documents and then convert into Excel. It is intelligently designed and tolerant of subtle formatting changes within a table, so it doesn’t just truncate the data when it crosses perceived cell boundaries.
Hex Editor Neo is a great little editor that allows you to edit large binary and ASCII files and do lots of other cool things besides (basic features are also available in a free version).
Radio propagation
The ITU page for Software, Data and Validation examples for ionospheric and tropospheric radio wave propagation and radio noise contains many useful spreadsheets and scripts implementing the recommendations arising from the Study Group 3.
Geodesy
If you want to know how to solve the geodesic forward or inverse problem, then the is an online implementation of Geosolve to help.
Spectrum management
The spectrummonitoring website has really good summaries of cellular operators’ spectrum holdings.
The Harmonised Calculation Method embodies many cross border methods in use within CEPT and also contains a really handy codification system of antenna patterns.
Interesting blogs
The YO3IIU blog contains some interesting experiments with SDR.