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Also see Legal documents

Tracking

The following service manage startup cap tables, much better than a spreadsheet! And most are free. Lower price tiers are shown.

• Capography. Free up to 20 equityholders, then $199/yr
• Capshare.   Free up to 10 equityholders. $30/mo for up to 24.
• SmartCap.  Free up to 30 equityholders. $50/mo unlimited
• TruEquity. Free up to 10 equityholders. $19/mo (includes 10, each additional $1.20) 

The next step up are equity management services like Two Step Software,eProsper, and Transcentive.

Convertible Notes & Equity

• Everything You Ever Wanted To Know About Convertible Note Seed Financings (But Were Afraid To Ask)
• The Truth About Convertible Debt at Startups and The Hidden Terms You Didn’t Understand by Mark Suster
• Startup Lawyer - multiple articles

Exiting

• Exit Round. "The private, anonymous marketplace for founders to discreetly explore strategic acquisition opportunities."