RTG Bills - Billing Made Easy: RTG Bills is software for legal billing and time tracking; for attorneys in law firms and sole practitioners; lawyer billing and accounting software; trust accounting

Chargebee - Chargebee lets you manage subscriptions and payments at scale, handle custom recurring billing scenarios, reduce subscription churn and simplify accounting.

CaseFox - Web-based legal software for law firms and lawyers that has timekeeping, legal billing, expense tracking, time billing, trust accounting, case management, and many more features.

Recurly - Subscription billing and recurring billing management. Recurly offers enterprise-class subscription billing for thousands of companies worldwide.

TekLAW - New Wave Tek, home of TekLaw law office practice management software. Calendaring, billing, case management software.

Zuora - Zuora creates cloud-based software on a subscription basis that enables any company in any industry to successfully launch, manage, and transform into a subscription business.