There's a subforum dedicated to aliquot sequences at mersenneforum.org.

Aliqueit

A C++ program for computing and verifying aliquot sequences. Designed to be run autonomously.

The actual factoring is mostly done with external programs. Trial division and Pollard rho are done internally, P-1/P+1/ECM are done with GMP-ECM, QS is done with Msieve or YAFU, and GNFS is done with ggnfs. Aliqueit tries to minimise the time spent factoring by running different methods to different depths depending on the composite size. The program is quite configurable through its aliqueit.ini file.

Windows 32/64-bit executables are available along with MSVC 2008 project files and source code that should also compile under linux. It may be possible to get it working on other systems as well without too much hassle. You'll need a gmp lib if you want to compile the source.

Download

Windows executables and source code: aliqueit v1.12
26 Sep 2011
389 KB

External factoring programs

Most everything, incl. x64 versions
GMP-ECM
Msieve
YAFU
GGNFS