Free Online Tools
Font File Converter
CloudConvert converts your font files online. Amongst many others, they support TTF, OTF and WOFF.
Open Source Self Hosted
Self-hosted Image Hosting solution
Build your own Pexels / Unsplash image hosting / sharing site. Easy installation and configuration. Enjoy!
Free Software
Poedit
Poedit is one of the most populare programs to edit languages files. The free version has plenty of options.