The double-Compton telescope COMPTEL flew on the NASA Compton Gamma Ray Observatory (CGRO) satellite from 1991 to 2000,
and is still the basis of most of our knowledge of the 1-30 MeV sky.
Pending new missions like eAstrogam, for the next decade COMPTEL will still be a major resource for MeV gamma rays.
A long-term effort to exploit heritage COMPTEL data is underway at MPE and MPA Garching.
The full 9-year COMPTEL mission covered the entire sky.
Several new developments are in progress for COMPTEL:
the COMPTEL data analysis system was partly ported to Linux,
new event processing techniques improve the background rejection, and new energy ranges are defined to avoid background lines.
Time-of-flight background rejection has been improved using intra-detector resolution instead of just per detector, and this is combined with
pulse-shape discrimination in a 2D analysis.
A new source catalogue will be generated with the new event processing.
The maximum-entropy skymapping method for COMPTEL
has been updated to use current state-of-the art
convolution on the sphere and the HealPix sky projection
and the method has been adapted to modern hardware.
New skymaps based on these developments are presented.