Most links on this page lead to english-language pages and are marked 
, some are in German and are marked 
.
Administration
| Link | Lan. | Description |
| Manual: Backing up a wiki | | This page provides an overview of the backup process for a typical MediaWiki wiki |
Mapping
Data
Maps
| Link | Lan. | Description |
| OWS terrestris | | OGC-conforming services like OpenStreetMap WMS |
Spatial Reference Systems
| Link | Lan, | Description |
| koordinaten-umrechner.de | | Coordinate calculator for WGS84, UTM, CH1903, UTMREF(MGRS), Gauß-Krüger, NAC, W3W by deine-berge.de |
| EPSG.io | | Coordinate Systems Worldwide |
Geofabrik
| Link | Lan. | Description |
| Tools | | An launchpad for the four tools listed below. |
| Map | | A full-screen slippy map with several different map views, a tile grid for debugging, and links to many other maps. |
| Map Compare | | Compare two maps side by side. Several OpenStreetMap and Google maps are available. |
| OSM Inspector | | This tool offers different views on the OpenStreetMap data. It can be used to get a better idea how the data in the database looks like and it can point out omissions or errors. |
| Tile Calculator | | This tool can calculate the estimated size of tiles in an area, allows to obtain bounding boxes from a specific area or calculate print margins. |
KlokanTech
| Link | Lan. | Description |
| Boundingbox | | Search a location with OpenStreetMap, obtain its bounding box. |
OpenStreetMap
Web Maps
There are different tools to render maps on the Web. As far as my hobby projects are concerned, I prefer Leaflet because it is more accessible to the uninitiated and gets things done without much ado. There however are more advanced applications for which OpenLayers would be my choice due to its larger expressive power but with great power comes great complexity. 
Leaflet
| Link | Lan. | Description |
| Leaflet | | a widely used open source JavaScript library used to build web mapping applications. |
| leaflet-boundary-canvas | | BoundaryCanvas is a Leaflet plugin for drawing tiled raster layers with arbitrary boundaries. |
| Leaflet.fullscreen | | A fullscreen control for Leaflet |
| Leaflet.markercluster | | Provides animated marker clustering for leaflet. |
| Leaflet.TileLayer.ColorFilter | | A simple and lightweight Leaflet plugin to apply CSS color filters on map tiles (it e.g. can make them display in grayscale). |
Programming
JavaScript
Browser
| Link | Lan. | Description |
| You might not need jQuery | | With modern browsers you rarely need to use jQuery anymore. This site explains how you can replace much of what jQuery provides by plain JavaScript. |
| nefe/You-Dont-Need-jQuery | | This is essentially the same but a) is it a git repository you can clone and b) it has a number of translations. |
| Microjs | | Fantastic Micro-Frameworks and Micro-Libraries for Fun and Profit! |
| jq | | jq is a lightweight and flexible command-line JSON processor |
Software
Linux Console Programs
| Link | Lan. | Description |
| Midnight Commander (mc) | | A free cross-platform clone of the Norton Commander file manager. |
| TMUX | | A terminal multiplexer. It lets you switch easily between several programs in one terminal, detach them (they keep running in the background) and reattach them to a different terminal. |
| WordGrinder | | a Unicode-aware character cell word processor that runs in a terminal (or a Windows console). It is designed to get the hell out of your way and let you get some work done. |
Overview Sites
| Link | Lan. | Description |
| freshcode.club | | This site is a reimplementation of FreshMeat/FreeCode, which shut down in June 2014. It's intended to become a community-driven website again. |
| Black Duck Open Hub | | The Worlds Largest Repository of Freely Available Analytics on Hundreds of Thousands of Open Source Projects, Contributors, Organizations, Languages, etc. |
Tutorials
General
| Link | Lan. | Description |
| Tutorialspoint | | One of the best online education resources when it comes to programming and the like |
RTKLIB
Security
Raspberry Pi
While much software can be installed install on a Raspberry Pi in the same manner as on any other Debian-based Linux, sometimes things are a bit more involved.
, some are in German and are marked 
.
