We used to use QuickBooks Online when we were doing it ourselves. But when we got a bookkeeper, he wanted to use the desktop version. We use SaaSOptics and Funding Gates in conjunction with QuickBooks, which I would recommend to everyone.
Funding Gates shows you a receivables dashboard, and tracks all receivables activity, including emails and calls, who’s likely to pay, who’s in trouble, etc. The guys who started this guys were analysts in the collections agency space, so they are extremely knowledgeable.
We use InsightSquared to show lead conversion.
We have an inside sales model, based on a sales person giving you a demo and then you buy offline. So our marketing efforts are really around building a big marketing funnel and creating nurture and drip campaigns to get marketing-qualified leads. We get stats on all that through HubSpot.
We're very happy with Salesforce, and our sales team is very heavily Salesforce-driven. When we started, we used Pipedrive, but as soon as you have any realistic sized sales team, you have to move. Salesforce was the inevitable choice. Like Trinet, it does everything you want, it's just not the most modern UI. Our sales development team runs a highly automated outbound demand-generation process. They use a variety of tools for list-building and enrichment, and automated multi-channel outreach (social media, phone calls, email). For each of those functions, we have tools that integrate with Salesforce: LinkedIn Sales Navigator, InsideSales.com and Outreach.
Dropbox is great for collaboration, but very hard to scale as we are scaling. We have tons of files, and when everyone has access to the same files with few permissions/controls over who can do what, things get inadvertently erased. It's just hard to manage with such widespread access.
When we started, TriNet served all our back-office problems (payroll, benefits, access to healthcare plans that you don’t get access to as a small company, great support). It was a no-brainer. The user experience can be confusing, but it takes care of so much of the process for you. At some point, companies outgrow Trinet, and hire in-house people who take over all of those tasks.
Our engineering team moved from Trello to JIRA because they had outgrown it, but the rest of the company uses Trello. The same things that made Trello powerful when we were small made it a barrier once we grew in size--lack of ability to sort, filter, and a very manual/visual nature. Those features are great when you can touch/see everything, but when you have too many things to touch/see, it doesn't work anymore.