Citizen Record Books
The male population of the Frisian towns could receive the title of ‘civilian’ or ‘poorterschap. In order to become self-employed, men had to be a member of a guild, and therefore civilianship was a requirement. The earliest records date from 1517, and the latest from 1811.
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Burgerlijke Stand / Registry of Births, Deaths, and Marriages
The registering of births, deaths, and marriages began in 1811. Since then, every municipality has recorded every birth, marriage, and death. These contain the information pertaining to the births (until 1913), marriages (until 1933), and deaths (until 1951/3), in the same way as those have been recorded since 1811 in the municipal records of the births, deaths, and marriages. With the exception of the municipalities of Weststellingwerf, scans of the original documents are available.

Doop-, Trouw-, Begraaf- en Lidmatenboeken (DTB of DTBL) voor 1812 / Christening, Marriage, Burial, and Membership (DTB or DTBL) records for 1812
You can find the names here of Christenings, Marriages, Deaths, and parish memberships, from the Christening, Marriages, Deaths, Burials, and parish membership records from the local Frisian churches, and services of the towns, municipalities, and the islands. The membership logs are continuous until 1850. Scans of the latter part of this period have been included in the database.
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This database contains information on emigration from a number of municipalities in Friesland to countries such as the USA and Canada. The indices/indexes can be found after consulting the municipalities concerned. The groundwork was done by Mrs A. Galema, who conducted extensive archive research for her dissertation. With the help of volunteers, Tresoar subsequently added further data from other municipalities.
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Inscriptions and epitaphs
The file Inscriptions and epitaphs contains data about persons from Friesland over the time period 1341-1901.These data are taken from inscriptions on tombstones, mourning signs, bricks, birth spoons, nameplates, church benches, church organs, church silver and furthermore.
The data were collected and imported by Mr Hessel de Walle.
Hessel de Walle is a member of the Epitaphs Commission of Genealogical Workers. This commission makes an overview of charts and other memorabilia that are found during restoration of old churches in Friesland. From the described objects photos have been made, which can be viewed on Hessel de Walle's website:

Kadaster / Cadastral maps
Both the maps from 1832 (minuutplans), as the maps from 1887 (netteplans) from all the Frisian cadastral municipalities have been digitilised. Each of the plots has been drawn on the maps, and each plot has been allocated an individual plot number.

Kamer van Koophandel / Chamber of Commerce
Since 1921, many companies have registered in the Provincial Trade Register. This register is kept up-to-date by a branche of the Chamber of Commerce in the area that the company is located. This includes almost all companies that existed in 1921 and/or dissolved before 1977.
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Memorie van successie / Records of Inheritance or Gift Tax
Records of inheritance, or gift tax, from (1818-1902) are overviews created by the Internal Revenue in order to document inheritances. They offer the researcher the possibility to gain an insight into the financial aspect of their ancestors. In addition, information can be found pertaining to members of their family that is otherwise difficult to find, The original certificates can be accessed in the Reading Room. Ordering copies of the original documents is not possible.
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Militairen 1795-1815 / Frisian Serviceman 1795-1815
The dossier Serviceman serving in the Army and Navy 1795-1815, contains records of the serviceman drafted from Friesland, serving in the army or navy of the Republic of the Seven United Netherlands, the Batavian Republic, the Kingdom of Holland, the French Empire, and/ or the Kingdom of the Netherlands (Waterloo).
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Naamsaanneming 1811 / Assumed Names 1811
This database contains the surnames that were assumed in Friesland in 1811 and 1812, with scans of the original documents. The registers from the islands, Het Bildt, Menaldumadeel, and Leeuwarden have been lost. NB. Many names had been noted incorrectly in the certificates. Therefore there are variants of the same name within one family.
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Nedergerechten / The Sub law Courts
The Sub Law Courts were local courts that governed a town or a rural district (a district guided by a ‘grietman’, who was a kind of mare of a local municipality). They were originated in the late Middle Ages when the larger court districts fell apart. That is the reason that the name of a lot of the Frisian rural districts end on –diel (=part).
The Saxon Ordinance of 1504 regulated local jurisdiction.
Until the French time government and law weren’t separated. Therefor the grietman can be compared with the mare but also with a sub judge. There was a big difference though concerning the powers of the grietman in both duties. In government duties he wasn’t bothered by co governors, but as a judge he had to form a group of three of four assessors, also called sub judges. One of them functioned as substitute grietman. Of course the grietman was the chairman of the sub court. Usually neither the grietman, nor the assessors had studied law. It was the duty of the secretary, most times a lawyer, to lead the process smoothly.

Notarieel archief / Notary archive
This database contains records of certificates, drawn up by the notaries of Friesland, during the period 1809-1925. This provides access to wills (until 1915), records of the separation of property, sales records of estates, records of debts, and various other records for which notaries were necessary.
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Ontvanger Generaal
Out of the ordinary payments by the Executive Council of Friesland were funded by the monastic goods , were recorded in a set of two ledgers that are titled ‘Extraordinaris’ (1592-1646).
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Pottenbakkers / Potters
This database contains the details from advertisements from the Leeuwarder Courant (1752-1900) pertaining to potters, potter’s workshops, potter's ships, pots and pans.
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The quaclappen (quaet clappen = speaking ill of someone, gossiping) contain the brief texts of verdicts of the Court of Friesland in civil cases. This database contains the names of parties (defence and prosecution) from the period 1527-1591, as they have been recorded in the quaclappen.
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Quotisatie 1749
The quotisatie, a tax based on financial capacity, was established in 1749. In this year, every town and municipality made reports containing the records about the family compostition, and the welfare, on the basis of the quotisatie tax.
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Registres Civiques
The names of persons entitled to vote (1811/1812) are contained within the Registre Civique. Persons entitled to vote were male, and 21 years old and older. The registers contain such records as first and surnames, family names (patriniemen), professions, birth dates, registry numbers, and (sometimes) addresses.
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Rolboeken (Strafrecht) / Court Lists (Criminal Law)
This contains the names of defendants who appeared before the district courts, from 1838, in respectively Heerenveen (until 1924), Leeuwarden (until 1940, but records are accessible up to 75 years in the past), and Sneek (until 1878). Scans of the original documents have been added and offer information on the nature of the case and the sentence. Records of the sentences can be accessed in the Reading Rooms of Tresoar.
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The stemkohieren enabled the owners and the users to register the products of the voting members, which were mostly farms. In this database you can find access to the printed stemkohieren of 1698 and 1728.
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You can find information here about payments made by the Provincial Executive of Friesland to pupils and students (alumni) during the period of 1592-1646. This scholarship was often referred to then as ‘pensie’.
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Tietjerksteradeel bevolking
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Tietjerksteradeel hypotheekboeken
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Tietjerksteradeel informatieboeken
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Tietjerksteradeel speciekohieren
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Volkstelling 1744 / Census 1744
According to the source ‘Description of families’, the population of Friesland (with the exception of the islands), tallied 135.133 inhabitants. In this database, you will find names of the head of the family, as well as the size of the family, amongst other information.
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Volkstellingsregister / Census Registers
Censuses were held every ten years in The Netherlands since 1829. Several Frisian municipalities have also kept the complete registration form from the years 1829 and 1839. 
The censuses were not always updated, resulting in the records of the census registers quickly becoming outdated, and they therefore only offer an indication of the information available at that time. The census registers cannot be searched individually, but are included in your search query in the Registry of Births, Deaths, and Marriages.  
More on the census on wikipedia: 

Wijkregister / District Registers
The municipality of Leeuwarden began constructing a so-called Register of Districts in 1843. Until the end of 1847, all records of settlement and departure, were recorded per address in this Register, whereby children under the age of sixteen years were only recorded numerically and not by name. In 1848, the District Register was no longer updated due to the national introduction of the Bevolkingsregister (Registery of Births, Deaths, and Marriages). The District Registers cannot be searched individually, but will be included in your search query in the Registry of Births, Deaths, and Marriages of Leeuwarden.