Apps similar to Plus Codes include QGIS, which is free and open source. Other options are GeoSpy, what3words, ArcGIS and Maptitude. There's no shortage of GIS Software like Plus Codes, with more than 25 alternatives for Windows, the web, Linux, Mac and Android.
Azimap is a web GIS developed on open source principles and offers GI professionals with the tools to visualise, analyse and share their spatial data on the web.
An easy, open, worldwide, affordable API to convert coordinates to places or vice versa. Free and paid usage levels. Libraries for most programming languages.
Germany
EU
GeoSheets is a free add-on for Google Spreadsheets that makes it simple to do lightweight GIS tasks like geocoding, address normalization, distance calculations and creating customized and embeddable maps.
Postnick globally simplifies, standardizes and democratizes postal addresses. It is an online address wallet letting people manage all their postal addresses in one place and assign custom nicknames (>>postnicks) to them, like >>john.home.
United States
GeniusGIS is an affordable, robust, Cloud-based Small Business mapping application. Find the ideal location or territory for your business. Access a host of ready-made data sets to help unlock the true value of any geographical location.
United Kingdom
