| Astrophysical Calculator | Coordinate transformation | Julian date converter | Conversion of units |
| Unit Conversion | Numerical Methods | StatCodes On-line statistical software | Coord. Conversion + Precession (alt. page) |
| Coord. Conv. (now inactive) | Magn/Flux/Jy-converter | On-line Manuals IRA-CNR | HTML Guides (many dead links) |
| HTML Primer | -- | -- | -- |