Debtrak - Debtrak is an international, multi-lingual, multi-currency Debt Collection Software System designed to cater for the entire debt lifecycle from the point of invoice generation through to settlement.
MathCrunch - Learn math stress free
TrioSoft Quantum - Quantum, a full featured debt collection agency software suite, Quantum has been designed with the debt collector's needs in mind.
Learney - Knowledge aggregator for developers
CARM-Pro - Debt Collection
Paperspade - Type math easily through just English text!