Basecamp works with a variety of iPhone apps, third-party billing/invoicing tools, mock-up review software, time tracking tools, widgets, and more.

Note: These apps and integrations are not endorsed or tested by 37signals. 37signals does not assume responsibility or liability for any issues caused by the use of third party products.

iPhone Applications

	Insight $9.99 in the App Store. (iTunes link)		Outpost $12.99 in the App Store.
	Minivan $6.99 in the App Store.		Groundwork $7.99 in the App Store.
	BC Files $3.99 in the App Store.		Chieftent $9.99 in the App Store.
	Sherpa $3.99 in the App Store.		Projects $9.99 in the App Store.
	Headquarters $7.99 in the App Store.

Mobile

Beacon Access your Basecamp account on your Android mobile phone. Available now in the Android Market.	Outline Tracker Organize and track Basecamp tasks on your Palm WebOS smartphone.	TrailGuide An optimized mobile client for managing Basecamp projects "on the Go".	Scout for Tablet PC Access your Basecamp account from your Tablet PC. (watch a movie)
Phonified Tracker Access your Basecamp account over a cell phone with Phonified Tracker. Supports Nokia S60, Blackberries, and Treos.	Mesron Get your Basecamp milestone reminders via SMS text message on your mobile phone.

Reporting, Charts, Planning

YouCalc Reporting and analytics: milestone progress, activity reports, & more. Optimized for Safari on the iPhone.	Burndown Turn your Basecamp milestones and to-do lists into burndown charts.	AgileAgenda Start with your project, add task estimates, get gantt charts and schedule estimates.	PlannerX Plan projects in a single page outline view, use keyboard shortcuts, and “work 5 times faster.”
PPMLite Visualize portfolio, projects & milestones; drag-and-drop dates & sync back to Basecamp; reports & more.	VisioPlanning View the evolution of your projects, tasks and employees in real time.	BC Toolkit BC Toolkit provides detailed and accurate reporting for your Basecamp data.	IntelliGantt Client Dashboards. Multi-Project Views. Estimates & Actuals. Advanced Costing.
Report2Base Create reports on milestones, tasks, and messages as PDF or CSV files.	Timeline 3D Chart your Basecamp messages, to-dos, and milestones in a 3D presentation.	Easy Insight Create meaningful charts, reports, and more with your Basecamp information.	BC Viewer Present all your project milestones in a simple visual wallchart.

Invoicing, Billing, Accounting

Blinksale “The easiest way to send invoices online” now works with Basecamp.	FreshBooks Web-based invoicing and time tracking tool. Can even send invoices via Snail Mail.	Simply Invoices Simple web-based invoicing built to work beautifully with Basecamp.	Pulse Cash flow management tool makes tracking the health of your business simple.
Less Accounting Simple, web-based accounting solution for small businesses and freelancers.	FinancialForce Get invoicing and accounting info from Basecamp into Salesforce.	Cashboard Estimates, time tracking, and accounting for service-oriented businesses.	SimplifyThis Easily invoice your customers and get paid faster online.
The Invoice Machine For freelancers and businesses who want an easy way to manage invoices.	CannyBill Invoicing, billing & web hosting automation for businesses & designers.	Invotrak Import your todos from Basecamp right into your invoices and time sheets.

Software Development Tools

Beanstalk Beanstalk is a hosted Subversion system, making it easy to setup, browse, and track Subversion.	ProjectLocker ProjectLocker is a hosted Subversion and Trac system with source control, issue tracking, and Wiki.	Springloops A source code management tool focused on web development teams that integrates with Basecamp.	Fixx CA bug tracking and issue tracking system for software teams.
Assembla Subversion, Git, issue/bug tracking, and team alerts (to Basecamp) for software teams.	DoneDone Simple, smarter, web-based issue tracking to finish projects strong.

Time Tracking

Project Recon Project Recon is a widget for Windows that sits in the system tray and tracks time with Basecamp.	Tick Time tracking and budgeting tool that integrates with Basecamp.	Chronicle Track time spent on your Basecamp projects from your Windows PC.	Harvest Web-based time tracking for any small business or team that is client-services driven.
Toggl Time tracking tool that integrates with Basecamp. For freelancers and teams.	Sundial Post time entries to Basecamp via this Mac OS Dashboard Widget.	Basecamp Time Widget Enter time tracking for each project via this Mac OS dashboard widget.	Timy Timy is an easy-to-use desktop application to fill out your Basecamp timesheet.
Paymo Time tracking and invoicing tool that integrates with Basecamp.

Desktop Widgets

AlertThingy Brings the latest updates from social networks, Basecamp, and elsewhere direct to your desktop.	Avalanche Full-featured Yahoo! widget that works with Basecamp.	Sundial Post time entries to Basecamp via this Mac OS Dashboard Widget.	Basecamp Time Widget Enter time tracking for each project via this Mac OS dashboard widget.
Radar Radar is a native Mac app that notifies you of updates to your Basecamp account.

Miscellaneous

SproutIt Mailroom Hosted email management for your sales and support email that integrates with Basecamp.	ThickToast A simple system to load your BaseCamp XML export/backup into an Access database.	ConceptShare Setup online workspaces for sharing designs, documents, and video. Integrates with Basecamp.	Mailmanagr Allows for posting of Messages, Milestones and Todos to your Basecamp account via e-mail.
Periscope Gadget Basecamp control on iGoogle and inside GMail.	ProofHQ Design collaboration, proofing and approval tool for brands, agencies, designers, etc.	RunMyProcess Integrate your Basecamp information with other applications without any programming.	telegraph Import information from other systems into your Basecamp account if they support RSS or Atom.
Spootnik Synchronizes OmniGroup’s OmniFocus application with Basecamp and vice versa.	txtinn^ Allows you to create, schedule and monitor mobile SMS notifications and campaigns.	Lifestream Backup Backup your important Basecamp data automatically with this secure service.	GetSignOff Present and organize your site design variations to clients and manage feedback.
Freshlog Take a screenshot of your web or app design and send it to Basecamp automatically.	SimpleDiagrams Express your ideas quickly by creating diagrams with this desktop application.	Centripetal Complete retrieval and archiving of all your Basecamp data and files.